Merge branch 'main' into pr/wildlife-sightings

src/cameraHandoff.test.mjs

@@ -223,11 +223,20 @@ test('validated voice camera destinations share the UI navigation authority faca
     'move camera',
   );
   ordered(move, [
-    "if (!['orbit', 'pan', 'tilt', 'rotate', 'rotate_globe'].includes(motion))",
+    'if (argsError) return argsError;',
     'const start = () => {',
     /const preserveCameraFlight =\s*motion === 'orbit'/,
     'runNavigation(start, { preserveCameraFlight })',
   ], 'move validation before handoff');
+  const moveArgs = body(
+    cameraVerbs,
+    /export function moveCameraArgsError\(args = \{\}\) \{([\s\S]*?)\n\}/,
+    'move camera argument checks',
+  );
+  assert.ok(
+    moveArgs.includes("if (!['orbit', 'pan', 'tilt', 'rotate', 'rotate_globe'].includes(motion))"),
+    'unknown motions are refused before handoff',
+  );
 
   const route = body(
     cameraVerbs,

src/cameraTilt.test.mjs

@@ -0,0 +1,773 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import * as Cesium from 'cesium';
+import {
+  adjustOrbitRange,
+  getActiveCameraMotion,
+  initCameraVerbs,
+  interruptCameraMotion,
+  moveCamera,
+} from './cameraVerbs.js';
+import { createGevActionRunner } from './voice/gevActions.js';
+
+const radians = Cesium.Math.toRadians;
+const degrees = Cesium.Math.toDegrees;
+
+/** Real Cesium camera over London with no renderer: the voice fly-to frame. */
+function harness(
+  t,
+  { height = 4000, heading = 0, pitch = -90, pivot = true } = {},
+) {
+  const realPerformance = globalThis.performance;
+  let nowMs = 0;
+  globalThis.performance = { now: () => nowMs };
+  const canvas = Object.assign(new EventTarget(), {
+    clientWidth: 1280,
+    clientHeight: 800,
+    width: 1280,
+    height: 800,
+  });
+  const ellipsoid = Cesium.Ellipsoid.WGS84;
+  const scene = {
+    canvas,
+    drawingBufferWidth: 1280,
+    drawingBufferHeight: 800,
+    frameState: { mode: Cesium.SceneMode.SCENE3D },
+    mapProjection: new Cesium.GeographicProjection(ellipsoid),
+    globe: { ellipsoid },
+    mapMode2D: Cesium.MapMode2D.INFINITE_SCROLL,
+    mode: Cesium.SceneMode.SCENE3D,
+    pixelRatio: 1,
+    tweens: [],
+    requestRender() {},
+  };
+  const camera = new Cesium.Camera(scene);
+  scene.camera = camera;
+  camera.setView({
+    destination: Cesium.Cartesian3.fromDegrees(-0.1276, 51.5072, height),
+    orientation: { heading: radians(heading), pitch: radians(pitch), roll: 0 },
+  });
+  const viewer = {
+    camera,
+    scene,
+    trackedEntity: undefined,
+    trackedEntityChanged: new Cesium.Event(),
+    clock: { onTick: new Cesium.Event() },
+  };
+  // The app's view target: the ground point under the screen centre.
+  const viewTarget = () => {
+    const ray = new Cesium.Ray(camera.positionWC, camera.directionWC);
+    const hit = Cesium.IntersectionTests.rayEllipsoid(ray, ellipsoid);
+    return hit ? Cesium.Ray.getPoint(ray, hit.start) : undefined;
+  };
+  const target = viewTarget();
+  initCameraVerbs(viewer, pivot ? viewTarget : () => undefined);
+  t.after(() => {
+    interruptCameraMotion('test-cleanup');
+    globalThis.performance = realPerformance;
+  });
+  const tick = (seconds = 1 / 30) => {
+    nowMs += seconds * 1000;
+    viewer.clock.onTick.raiseEvent(viewer.clock);
+  };
+  const finish = () => {
+    for (let i = 0; i < 600 && getActiveCameraMotion(); i += 1) tick();
+    assert.equal(getActiveCameraMotion(), null, 'tilt must finish');
+  };
+  return { viewer, camera, target, tick, finish, viewTarget };
+}
+
+const pitchDeg = (camera) => degrees(camera.pitch);
+/** Tick until done() holds; a regression fails here instead of hanging. */
+const tickUntil = (h, done, frames = 600) => {
+  for (let i = 0; i < frames && !done(); i += 1) h.tick();
+  assert.ok(done(), `not reached in ${frames} frames`);
+};
+const headingDeg = (camera) =>
+  degrees(Cesium.Math.negativePiToPi(camera.heading));
+
+/** Metres between the original centre and the ground now under the crosshair. */
+function centreDrift(h) {
+  return Cesium.Cartesian3.distance(h.viewTarget(), h.target);
+}
+
+test('tilt up leaves a top-down view and keeps the place centred', (t) => {
+  const h = harness(t);
+  const result = moveCamera({ motion: 'tilt', direction: 'up' });
+  assert.equal(result.ok, true);
+  h.finish();
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - -75) < 0.5,
+    `pitch ${pitchDeg(h.camera)}`,
+  );
+  assert.ok(centreDrift(h) < 5, `centre drifted ${centreDrift(h)} m`);
+  assert.ok(Cesium.Matrix4.equals(h.camera.transform, Cesium.Matrix4.IDENTITY));
+});
+
+test('continuous tilt up from top-down keeps moving', (t) => {
+  const h = harness(t);
+  assert.equal(
+    moveCamera({ motion: 'tilt', direction: 'up', mode: 'continuous' }).ok,
+    true,
+  );
+  for (let i = 0; i < 30; i += 1) h.tick();
+  assert.equal(getActiveCameraMotion()?.kind, 'tilt');
+  assert.ok(pitchDeg(h.camera) > -82, `pitch ${pitchDeg(h.camera)}`);
+});
+
+test('a requested angle tilts to that pitch', (t) => {
+  const h = harness(t);
+  const result = moveCamera({ motion: 'tilt', pitchDeg: -45 });
+  assert.equal(result.ok, true);
+  assert.equal(result.direction, 'up');
+  assert.equal(result.pitchDeg, -45);
+  h.finish();
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - -45) < 0.5,
+    `pitch ${pitchDeg(h.camera)}`,
+  );
+  assert.ok(centreDrift(h) < 5, `centre drifted ${centreDrift(h)} m`);
+});
+
+test('a bare tilt settles on the default oblique angle', (t) => {
+  const h = harness(t);
+  const result = moveCamera({ motion: 'tilt' });
+  assert.equal(result.ok, true);
+  assert.equal(result.pitchDeg, -45);
+  h.finish();
+  assert.ok(Math.abs(pitchDeg(h.camera) - -45) < 0.5);
+});
+
+test('a requested angle can tilt back down toward top-down', (t) => {
+  const h = harness(t, { pitch: -30 });
+  const result = moveCamera({ motion: 'tilt', pitchDeg: -80 });
+  assert.equal(result.direction, 'down');
+  h.finish();
+  assert.ok(Math.abs(pitchDeg(h.camera) - -80) < 0.5);
+});
+
+test('requested angles clamp to the tilt limits', (t) => {
+  const h = harness(t);
+  assert.equal(moveCamera({ motion: 'tilt', pitchDeg: -2 }).pitchDeg, -5);
+  h.finish();
+  assert.ok(Math.abs(pitchDeg(h.camera) - -5) < 0.5);
+});
+
+test('a positive angle is read as the same angle below the horizon', (t) => {
+  const h = harness(t);
+  assert.equal(moveCamera({ motion: 'tilt', pitchDeg: 45 }).pitchDeg, -45);
+  h.finish();
+  assert.ok(Math.abs(pitchDeg(h.camera) - -45) < 0.5);
+});
+
+for (const pitch of ['', null, false, ' ', 'steep'])
+  test(`a blank or non-numeric angle ${JSON.stringify(pitch)} is ignored`, (t) => {
+    harness(t);
+    const result = moveCamera({ motion: 'tilt', pitchDeg: pitch });
+    // No angle and no direction: the default oblique view, never the horizon.
+    assert.equal(result.pitchDeg, -45);
+  });
+
+test('a requested angle the camera already holds is a no-op', (t) => {
+  harness(t, { pitch: -45 });
+  const result = moveCamera({ motion: 'tilt', pitchDeg: -45 });
+  assert.equal(result.ok, true);
+  assert.equal(result.unchanged, true);
+  assert.equal(getActiveCameraMotion(), null);
+});
+
+for (const pitch of [-90, -89]) {
+  test(`a top-down view asked for ${pitch}° stays put`, (t) => {
+    // The tool description calls -89 top-down; the clamp must not tilt a
+    // -90° view up 1° and report it as a move up.
+    const h = harness(t);
+    const before = pitchDeg(h.camera);
+    const result = moveCamera({ motion: 'tilt', pitchDeg: pitch });
+    assert.equal(result.ok, true);
+    assert.equal(result.unchanged, true);
+    assert.equal(result.pitchDeg, Math.round(before));
+    assert.equal(getActiveCameraMotion(), null);
+    assert.equal(pitchDeg(h.camera), before);
+  });
+}
+
+test('tilt down from top-down still refuses honestly', (t) => {
+  harness(t);
+  const result = moveCamera({ motion: 'tilt', direction: 'down' });
+  assert.equal(result.ok, false);
+  assert.match(result.error, /straight down/);
+});
+
+test('a tilt up nudge stops at the horizon limit', (t) => {
+  const h = harness(t, { pitch: -12 });
+  assert.equal(moveCamera({ motion: 'tilt', direction: 'up' }).ok, true);
+  h.finish();
+  assert.ok(Math.abs(pitchDeg(h.camera) - -5) < 0.5);
+});
+
+test('without a ground pivot a tilt still leaves top-down in place', (t) => {
+  const h = harness(t, { pivot: false });
+  const before = Cesium.Cartesian3.clone(h.camera.positionWC);
+  assert.equal(moveCamera({ motion: 'tilt', direction: 'up' }).ok, true);
+  h.finish();
+  assert.ok(Math.abs(pitchDeg(h.camera) - -75) < 0.5);
+  assert.ok(Cesium.Cartesian3.distance(h.camera.positionWC, before) < 1e-6);
+});
+
+for (const heading of [0, 30, -120])
+  test(`tilt from top-down keeps the ${heading}° heading`, (t) => {
+    const h = harness(t, { heading, height: 67000 });
+    // Top-down float noise must not pick a new heading for the pivot.
+    assert.equal(moveCamera({ motion: 'tilt', pitchDeg: -45 }).ok, true);
+    h.finish();
+    assert.ok(
+      Math.abs(headingDeg(h.camera) - heading) < 1,
+      `heading ${headingDeg(h.camera)}`,
+    );
+    assert.ok(centreDrift(h) < 50, `centre drifted ${centreDrift(h)} m`);
+  });
+
+test('an oblique tilt keeps its heading toward the pivot', (t) => {
+  const h = harness(t, { heading: 75, pitch: -60 });
+  assert.equal(moveCamera({ motion: 'tilt', pitchDeg: -30 }).ok, true);
+  h.finish();
+  assert.ok(Math.abs(headingDeg(h.camera) - 75) < 0.5);
+  assert.ok(centreDrift(h) < 5, `centre drifted ${centreDrift(h)} m`);
+});
+
+test('a pivoting tilt yields when tracking takes the camera', (t) => {
+  const h = harness(t);
+  assert.equal(moveCamera({ motion: 'tilt', pitchDeg: -45 }).ok, true);
+  h.tick();
+  const entity = { id: 'tracked' };
+  h.viewer.trackedEntity = entity;
+  h.viewer.trackedEntityChanged.raiseEvent(entity);
+  assert.equal(getActiveCameraMotion(), null);
+});
+
+/** Metres between the camera and the point it pivots about. */
+const pivotRange = (h) =>
+  Cesium.Cartesian3.distance(h.camera.positionWC, h.target);
+const heightM = (camera) =>
+  Cesium.Cartographic.fromCartesian(camera.positionWC).height;
+
+test('a zoom during a pivoting tilt changes the range it holds', (t) => {
+  const h = harness(t);
+  assert.equal(
+    moveCamera({ motion: 'tilt', direction: 'up', mode: 'continuous' }).ok,
+    true,
+  );
+  h.tick();
+  const before = pivotRange(h);
+  assert.deepEqual(
+    adjustOrbitRange(0.5),
+    { kind: 'tilt', changed: true },
+    'the tilt must take the zoom',
+  );
+  for (let i = 0; i < 5; i += 1) h.tick();
+  // The next frame's lookAt must not put the old range back.
+  assert.ok(
+    Math.abs(pivotRange(h) - before / 2) < 1,
+    `range ${pivotRange(h)} m, wanted ${before / 2} m`,
+  );
+});
+
+test('a zoom with no pivot to hold is left to the camera', (t) => {
+  harness(t, { pivot: false });
+  moveCamera({ motion: 'tilt', direction: 'up', mode: 'continuous' });
+  assert.equal(adjustOrbitRange(0.5), null);
+});
+
+test('a pivot tilt toward the horizon keeps its clearance above the ground', (t) => {
+  // A close top-down view: swinging 250 m of range to -5° would end ~22 m up.
+  const h = harness(t, { height: 250 });
+  assert.equal(moveCamera({ motion: 'tilt', pitchDeg: -5 }).ok, true);
+  let lowest = Infinity;
+  for (let i = 0; i < 600 && getActiveCameraMotion(); i += 1) {
+    h.tick();
+    lowest = Math.min(lowest, heightM(h.camera));
+  }
+  assert.equal(getActiveCameraMotion(), null, 'tilt must finish');
+  assert.ok(lowest > 149, `camera dropped to ${lowest} m`);
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - -5) < 0.5,
+    `pitch ${pitchDeg(h.camera)}`,
+  );
+  assert.ok(Cesium.Matrix4.equals(h.camera.transform, Cesium.Matrix4.IDENTITY));
+});
+
+test('a continuous tilt up from close in keeps its clearance', (t) => {
+  const h = harness(t, { height: 250 });
+  moveCamera({ motion: 'tilt', direction: 'up', mode: 'continuous' });
+  for (let i = 0; i < 600 && getActiveCameraMotion(); i += 1) {
+    h.tick();
+    assert.ok(heightM(h.camera) > 149, `camera at ${heightM(h.camera)} m`);
+  }
+  assert.ok(Math.abs(pitchDeg(h.camera) - -5) < 0.5);
+});
+
+test('a city-scale pivot tilt keeps the place centred to the horizon limit', (t) => {
+  const h = harness(t);
+  moveCamera({ motion: 'tilt', pitchDeg: -5 });
+  h.finish();
+  // 4 km of range clears the floor at every pitch: all pivot, no drift.
+  assert.ok(centreDrift(h) < 5, `centre drifted ${centreDrift(h)} m`);
+});
+
+test('pitchDeg against a contradicting direction is refused', (t) => {
+  harness(t, { pitch: -45 });
+  // "tilt down 10 degrees": -10° is an absolute angle, which is up from -45°.
+  const result = moveCamera({
+    motion: 'tilt',
+    direction: 'down',
+    pitchDeg: 10,
+  });
+  assert.equal(result.ok, false);
+  assert.match(result.error, /absolute angle/);
+  assert.equal(getActiveCameraMotion(), null);
+});
+
+test('pitchDeg with a direction that agrees still tilts', (t) => {
+  const h = harness(t, { pitch: -45 });
+  const result = moveCamera({
+    motion: 'tilt',
+    direction: 'down',
+    pitchDeg: -80,
+  });
+  assert.equal(result.ok, true);
+  assert.equal(result.direction, 'down');
+  h.finish();
+  assert.ok(Math.abs(pitchDeg(h.camera) - -80) < 0.5);
+});
+
+test('the pitchDeg and direction check uses the camera pitch', (t) => {
+  // At regional range the Earth curves away and the pivot pitch is a degree
+  // or two shallower than the camera's (-30°); -29° is still up from it.
+  harness(t, { height: 150000, pitch: -30 });
+  const down = moveCamera({ motion: 'tilt', direction: 'down', pitchDeg: -29 });
+  assert.equal(down.ok, false);
+  assert.match(down.error, /tilts up, not down/);
+  const up = moveCamera({ motion: 'tilt', direction: 'up', pitchDeg: -29 });
+  assert.equal(up.ok, true);
+  assert.equal(up.direction, 'up');
+});
+
+test('after a zoom in, a pivoting tilt never lowers the camera further', (t) => {
+  const h = harness(t, { height: 1000 });
+  moveCamera({ motion: 'tilt', direction: 'up', mode: 'continuous' });
+  tickUntil(h, () => pitchDeg(h.camera) >= -30);
+  adjustOrbitRange(1 / 2.4);
+  adjustOrbitRange(1 / 2.4);
+  h.tick();
+  const afterZoom = heightM(h.camera);
+  for (let i = 0; i < 600 && getActiveCameraMotion(); i += 1) {
+    h.tick();
+    assert.ok(
+      heightM(h.camera) > afterZoom - 1,
+      `camera fell from ${afterZoom} m to ${heightM(h.camera)} m`,
+    );
+  }
+  assert.ok(Math.abs(pitchDeg(h.camera) - -5) < 0.5);
+});
+
+test('a zoom in during a close pivot tilt never pushes the camera out', (t) => {
+  // 62 m of range, under the 80 m zoom floor.
+  const h = harness(t, { height: 40, pitch: -40 });
+  moveCamera({ motion: 'tilt', direction: 'down', mode: 'continuous' });
+  h.tick();
+  const before = pivotRange(h);
+  assert.ok(before < 80, `range ${before} m`);
+  adjustOrbitRange(1 / 1.6);
+  h.tick();
+  assert.ok(pivotRange(h) <= before + 0.01, `range grew to ${pivotRange(h)} m`);
+});
+
+test('a zoom out during a far orbit never pulls the camera in', (t) => {
+  // 15,000 km up, beyond the 5,000 km zoom cap.
+  const h = harness(t, { height: 15_000_000 });
+  assert.equal(moveCamera({ motion: 'orbit', mode: 'continuous' }).ok, true);
+  h.tick();
+  const before = pivotRange(h);
+  assert.ok(before > 5_000_000, `range ${before} m`);
+  assert.deepEqual(adjustOrbitRange(2.4), { kind: 'orbit', changed: false });
+  h.tick();
+  assert.ok(pivotRange(h) >= before - 1, `range fell to ${pivotRange(h)} m`);
+});
+
+test('an out-of-range pitchDeg is clamped to the tilt limits', (t) => {
+  // The schema carries no range; 120 reads as 120° below the horizon.
+  const h = harness(t, { pitch: -45 });
+  assert.equal(moveCamera({ motion: 'tilt', pitchDeg: 120 }).ok, true);
+  h.finish();
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - -89) < 0.5,
+    `pitch ${pitchDeg(h.camera)}`,
+  );
+});
+
+test('a zoom in during a pivot tilt stops at the clearance', (t) => {
+  // 400 m of range at -40°, then "zoom in a lot" twice: unfloored, that left
+  // the camera about 107 m up, then at the 80 m zoom floor.
+  const h = harness(t, { height: 400 });
+  moveCamera({ motion: 'tilt', direction: 'up', mode: 'continuous' });
+  tickUntil(h, () => pitchDeg(h.camera) >= -40);
+  assert.deepEqual(adjustOrbitRange(1 / 2.4), { kind: 'tilt', changed: true });
+  // At -40° the floor is 150 / sin 40° ≈ 233 m, which the first zoom reached.
+  assert.deepEqual(adjustOrbitRange(1 / 2.4), { kind: 'tilt', changed: false });
+  // The camera must take that range, not just report it.
+  h.tick();
+  const floor = 150 / Math.sin(radians(40));
+  assert.ok(
+    Math.abs(pivotRange(h) - floor) < floor * 0.02,
+    `range ${pivotRange(h)} m, wanted about ${floor} m`,
+  );
+  for (let i = 0; i < 600 && getActiveCameraMotion(); i += 1) {
+    h.tick();
+    assert.ok(heightM(h.camera) > 149, `camera at ${heightM(h.camera)} m`);
+  }
+  assert.ok(Math.abs(pitchDeg(h.camera) - -5) < 0.5);
+});
+
+test('a voice zoom during a pivot tilt says what it changed', async (t) => {
+  const h = harness(t, { height: 400 });
+  const runner = createGevActionRunner({
+    viewer: h.viewer,
+    styleManager: {},
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  moveCamera({ motion: 'tilt', direction: 'up', mode: 'continuous' });
+  h.tick();
+  const zoom = { direction: 'in', amount: 'lot' };
+  const first = await runner('adjust_camera_zoom', zoom);
+  assert.equal(first.ok, true);
+  assert.equal(first.tiltRangeAdjusted, true);
+  assert.equal('orbitRadiusAdjusted' in first, false);
+  // 400 m → 167 m → the 150 m clearance; a third zoom in moves nothing, and
+  // says so.
+  assert.equal((await runner('adjust_camera_zoom', zoom)).ok, true);
+  const third = await runner('adjust_camera_zoom', zoom);
+  assert.equal(third.ok, false);
+  assert.match(third.error, /tilt is already at its closest range/);
+});
+
+test('from globe range a tilt happens in place', (t) => {
+  // A pivot 2,000 km out would swing the camera thousands of km.
+  const h = harness(t, { height: 2_000_000 });
+  const before = Cesium.Cartesian3.clone(h.camera.positionWC);
+  assert.equal(moveCamera({ motion: 'tilt', pitchDeg: -45 }).ok, true);
+  h.finish();
+  assert.ok(Math.abs(pitchDeg(h.camera) - -45) < 0.5);
+  assert.ok(Cesium.Cartesian3.distance(h.camera.positionWC, before) < 1e-3);
+});
+
+for (const height of [100_000, 400_000])
+  test(`from ${height / 1000} km a tilt to -5° ends with the camera at -5°`, (t) => {
+    // The pivot pitch is shallower than the camera's by up to 4° at this
+    // range; the camera reached only -5.9° and -8.6° when the swing stopped
+    // at a pivot pitch of -5°.
+    const h = harness(t, { height });
+    const result = moveCamera({ motion: 'tilt', pitchDeg: 5 });
+    assert.equal(result.pitchDeg, -5);
+    h.finish();
+    assert.ok(
+      Math.abs(pitchDeg(h.camera) - -5) < 0.5,
+      `pitch ${pitchDeg(h.camera)}`,
+    );
+    assert.ok(heightM(h.camera) > 149, `camera at ${heightM(h.camera)} m`);
+    const nudge = moveCamera({ motion: 'tilt', direction: 'up' });
+    assert.equal(nudge.ok, false);
+    assert.match(nudge.error, /upper tilt limit/);
+  });
+
+// From 550 km out the camera's -5° lies beyond the place's own horizon: the
+// swing ran into its clearance, let go of the pivot and tilted the rest in
+// place, which put the crosshair on the sky (28 to 63 km up), and a return
+// to top-down then landed 600 to 900 km from the place.
+for (const height of [600_000, 700_000, 900_000]) {
+  test(`from ${height / 1000} km a tilt to -5° keeps the place centred`, (t) => {
+    const h = harness(t, { height });
+    const result = moveCamera({ motion: 'tilt', pitchDeg: 5 });
+    assert.equal(result.ok, true);
+    h.finish();
+    assert.ok(h.viewTarget(), 'the crosshair is on the sky');
+    assert.ok(centreDrift(h) < 100, `centre drifted ${centreDrift(h)} m`);
+    assert.ok(heightM(h.camera) > 149, `camera at ${heightM(h.camera)} m`);
+    // The reply names the angle the camera reached, not the one asked for.
+    assert.ok(result.pitchDeg < -5, `reported ${result.pitchDeg}°`);
+    assert.ok(
+      Math.abs(pitchDeg(h.camera) - result.pitchDeg) < 0.5,
+      `camera at ${pitchDeg(h.camera)}°, reported ${result.pitchDeg}°`,
+    );
+    assert.match(result.note, /horizon/);
+    const nudge = moveCamera({ motion: 'tilt', direction: 'up' });
+    assert.equal(nudge.ok, false);
+    assert.match(nudge.error, /upper tilt limit/);
+    assert.equal(moveCamera({ motion: 'tilt', pitchDeg: -89 }).ok, true);
+    h.finish();
+    assert.ok(centreDrift(h) < 100, `centre drifted ${centreDrift(h)} m`);
+    // Back over the place at the range it began with (-89° is ~1° off nadir).
+    const range = Cesium.Cartesian3.distance(h.camera.positionWC, h.target);
+    assert.ok(
+      Math.abs(range - height) < height * 0.01,
+      `top-down ${range} m from the place`,
+    );
+  });
+
+  test(`a continuous tilt up from ${height / 1000} km stops with the place centred`, (t) => {
+    const h = harness(t, { height });
+    moveCamera({ motion: 'tilt', direction: 'up', mode: 'continuous' });
+    for (let i = 0; i < 1200 && getActiveCameraMotion(); i += 1) {
+      h.tick();
+      assert.ok(h.viewTarget(), `the crosshair is on the sky at frame ${i}`);
+    }
+    assert.equal(getActiveCameraMotion(), null, 'tilt must stop at its limit');
+    assert.ok(centreDrift(h) < 100, `centre drifted ${centreDrift(h)} m`);
+  });
+}
+
+test('a pitchDeg tilt toward the horizon limit says it is already there', (t) => {
+  const h = harness(t, { height: 900_000 });
+  moveCamera({ motion: 'tilt', pitchDeg: 5 });
+  h.finish();
+  const again = moveCamera({ motion: 'tilt', pitchDeg: 5 });
+  assert.equal(again.ok, false);
+  assert.match(again.error, /upper tilt limit/);
+});
+
+test('a regional tilt-up nudge goes to the camera horizon limit', (t) => {
+  // 20 km up at -7°: the pivot 186 km out sits at -5.3°, but the camera can
+  // still tilt up 2°.
+  const h = harness(t, { height: 20000, pitch: -7 });
+  assert.equal(moveCamera({ motion: 'tilt', direction: 'up' }).ok, true);
+  h.finish();
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - -5) < 0.5,
+    `pitch ${pitchDeg(h.camera)}`,
+  );
+});
+
+test('a voice tilt from a tracked view judges its limit from the camera pitch', (t) => {
+  const h = harness(t, { height: 20000, pitch: -5.2 });
+  h.viewer.trackedEntity = { id: 'tracked' };
+  // Voice releases the follow camera before the motion starts.
+  const release = (start) => {
+    h.viewer.trackedEntity = undefined;
+    return start();
+  };
+  const result = moveCamera({ motion: 'tilt', direction: 'up' }, release);
+  assert.equal(result.ok, false);
+  assert.match(result.error, /upper tilt limit/);
+});
+
+test('a zoom out during a pivoting tilt stops at the pivot range limit', (t) => {
+  // 900 km top-down, "tilt to 10°", then "zoom out a lot" twice: capped at
+  // the orbit's 5,000 km, the swing reached 2,386 km up at a real -44°.
+  const h = harness(t, { height: 900_000 });
+  assert.equal(moveCamera({ motion: 'tilt', pitchDeg: -10 }).ok, true);
+  h.tick();
+  assert.deepEqual(adjustOrbitRange(2.4), { kind: 'tilt', changed: true });
+  assert.deepEqual(adjustOrbitRange(2.4), { kind: 'tilt', changed: false });
+  let farthest = 0;
+  for (let i = 0; i < 600 && getActiveCameraMotion(); i += 1) {
+    h.tick();
+    farthest = Math.max(farthest, pivotRange(h));
+  }
+  assert.equal(getActiveCameraMotion(), null, 'tilt must finish');
+  assert.ok(farthest <= 1_000_001, `swung ${farthest} m from the pivot`);
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - -10) < 0.5,
+    `pitch ${pitchDeg(h.camera)}`,
+  );
+});
+
+test('an unchanged angle still stops a running motion through navigation', (t) => {
+  const h = harness(t);
+  moveCamera({ motion: 'tilt', direction: 'up', mode: 'continuous' });
+  tickUntil(h, () => pitchDeg(h.camera) >= -45.3);
+  let handoffs = 0;
+  const navigate = (start) => {
+    handoffs += 1;
+    return start();
+  };
+  const result = moveCamera({ motion: 'tilt', pitchDeg: -45 }, navigate);
+  assert.equal(result.ok, true);
+  assert.equal(result.unchanged, true);
+  assert.equal(handoffs, 1, 'the request must take navigation');
+  assert.equal(getActiveCameraMotion(), null, 'the tilt must stop');
+  const held = pitchDeg(h.camera);
+  for (let i = 0; i < 30; i += 1) h.tick();
+  assert.equal(pitchDeg(h.camera), held);
+});
+
+for (const direction of ['left', 'right'])
+  test(`a tilt ${direction} is refused`, (t) => {
+    harness(t, { pitch: -45 });
+    const result = moveCamera({ motion: 'tilt', direction });
+    assert.equal(result.ok, false);
+    assert.match(result.error, /tilt needs up or down/);
+    const angled = moveCamera({ motion: 'tilt', direction, pitchDeg: -30 });
+    assert.equal(angled.ok, false);
+    assert.match(angled.error, /pitchDeg alone/);
+    assert.equal(getActiveCameraMotion(), null);
+  });
+
+// The 1,000 km pivot cutoff includes its boundary: at exactly 1,000 km the
+// pivot range came back a hair over it, so the tilt ran in place and put the
+// crosshair on the sky.
+test('from exactly 1,000 km a tilt to -5° still pivots about the place', (t) => {
+  const h = harness(t, { height: 1_000_000 });
+  const result = moveCamera({ motion: 'tilt', pitchDeg: 5 });
+  assert.equal(result.ok, true);
+  h.finish();
+  assert.ok(h.viewTarget(), 'the crosshair is on the sky');
+  assert.ok(centreDrift(h) < 100, `centre drifted ${centreDrift(h)} m`);
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - result.pitchDeg) < 0.5,
+    `camera at ${pitchDeg(h.camera)}°, reported ${result.pitchDeg}°`,
+  );
+  assert.match(result.note, /horizon/);
+});
+
+// A zoom mid-tilt moves the pivot's horizon limit: the zoom's reply names the
+// angle the tilt now ends at, and the camera ends there.
+test('a zoom out during a tilt to an angle reports the angle it now ends at', (t) => {
+  const h = harness(t, { height: 400_000 });
+  const result = moveCamera({ motion: 'tilt', pitchDeg: -5 });
+  assert.equal(result.pitchDeg, -5);
+  assert.equal(result.note, undefined);
+  for (let i = 0; i < 10; i += 1) h.tick();
+  const zoom = adjustOrbitRange(2.5);
+  assert.equal(zoom.kind, 'tilt');
+  assert.equal(zoom.changed, true);
+  h.finish();
+  assert.ok(h.viewTarget(), 'the crosshair is on the sky');
+  assert.ok(zoom.pitchDeg < -5, `zoom reported ${zoom.pitchDeg}°`);
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - zoom.pitchDeg) < 0.5,
+    `camera at ${pitchDeg(h.camera)}°, zoom reported ${zoom.pitchDeg}°`,
+  );
+  assert.match(zoom.note, /horizon/);
+});
+
+test('a zoom in during a horizon-limited tilt reports the angle it now reaches', (t) => {
+  const h = harness(t, { height: 900_000 });
+  const result = moveCamera({ motion: 'tilt', pitchDeg: -5 });
+  assert.ok(result.pitchDeg < -5, `reported ${result.pitchDeg}°`);
+  for (let i = 0; i < 10; i += 1) h.tick();
+  const zoom = adjustOrbitRange(1 / 2.4);
+  assert.equal(zoom.changed, true);
+  h.finish();
+  assert.equal(zoom.pitchDeg, -5);
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - -5) < 0.5,
+    `camera at ${pitchDeg(h.camera)}°`,
+  );
+});
+
+test('a voice zoom during a tilt to an angle passes on the new end angle', async (t) => {
+  const h = harness(t, { height: 400_000 });
+  const runner = createGevActionRunner({
+    viewer: h.viewer,
+    styleManager: {},
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  moveCamera({ motion: 'tilt', pitchDeg: -5 });
+  for (let i = 0; i < 10; i += 1) h.tick();
+  const zoom = await runner('adjust_camera_zoom', {
+    direction: 'out',
+    amount: 'lot',
+  });
+  assert.equal(zoom.ok, true);
+  assert.equal(zoom.tiltRangeAdjusted, true);
+  h.finish();
+  assert.ok(
+    Math.abs(pitchDeg(h.camera) - zoom.pitchDeg) < 0.5,
+    `camera at ${pitchDeg(h.camera)}°, zoom reported ${zoom.pitchDeg}°`,
+  );
+  assert.match(zoom.note, /horizon/);
+});
+
+// Late in the tilt the camera is already past the angle the new range's
+// horizon allows (from 400 km at -8°, a zoom out x2.5 reported -8°): past it
+// the place is behind the Earth, so the camera steps down to that limit with
+// the zoom, then holds it with no further jump, and the zoom's reply names
+// the angle it ends at, not the one it stood at.
+test('a late zoom out during a tilt steps to the new limit and reports it', (t) => {
+  const h = harness(t, { height: 400_000 });
+  moveCamera({ motion: 'tilt', pitchDeg: -5 });
+  for (let i = 0; i < 70; i += 1) h.tick();
+  const zoom = adjustOrbitRange(2.5);
+  assert.equal(zoom.changed, true);
+  h.tick();
+  assert.equal(zoom.pitchDeg, Math.round(pitchDeg(h.camera)));
+  let last = pitchDeg(h.camera);
+  let maxStep = 0;
+  for (let i = 0; i < 600 && getActiveCameraMotion(); i += 1) {
+    h.tick();
+    maxStep = Math.max(maxStep, Math.abs(pitchDeg(h.camera) - last));
+    last = pitchDeg(h.camera);
+  }
+  assert.equal(getActiveCameraMotion(), null, 'tilt must finish');
+  assert.ok(maxStep < 0.1, `pitch jumped ${maxStep}° in one frame`);
+  assert.ok(h.viewTarget(), 'the crosshair is on the sky');
+  // Replies give whole degrees: the reported angle is the reached one rounded.
+  assert.equal(
+    zoom.pitchDeg,
+    Math.round(pitchDeg(h.camera)),
+    `camera at ${pitchDeg(h.camera)}°, zoom reported ${zoom.pitchDeg}°`,
+  );
+  assert.match(zoom.note, /horizon/);
+});
+
+// Easing from the camera's old pitch at the zoomed-out range put the camera
+// below the place's horizon: the first frame's crosshair hit the ground
+// 186 km from London, and London stayed hidden for ~11 frames.
+test('a late zoom out during a tilt keeps the place under the crosshair', (t) => {
+  const h = harness(t, { height: 400_000 });
+  moveCamera({ motion: 'tilt', pitchDeg: -5 });
+  for (let i = 0; i < 70; i += 1) h.tick();
+  const zoom = adjustOrbitRange(2.5);
+  assert.equal(zoom.changed, true);
+  for (let i = 0; i < 600 && getActiveCameraMotion(); i += 1) {
+    h.tick();
+    const hit = h.viewTarget();
+    assert.ok(hit, `frame ${i}: the crosshair is on the sky`);
+    const drift = centreDrift(h);
+    assert.ok(
+      drift < 100,
+      `frame ${i}: crosshair ${Math.round(drift)} m off the place`,
+    );
+  }
+  assert.equal(getActiveCameraMotion(), null, 'tilt must finish');
+  assert.ok(
+    Math.abs(pivotRange(h) - 1_000_000) < 1,
+    `range ${pivotRange(h)} m`,
+  );
+  assert.equal(
+    zoom.pitchDeg,
+    Math.round(pitchDeg(h.camera)),
+    `camera at ${pitchDeg(h.camera)}°, zoom reported ${zoom.pitchDeg}°`,
+  );
+  assert.match(zoom.note, /horizon/);
+});
+
+// The zoom out left the pivot pitch level with the place, so the zoom in's
+// clearance floor came out infinite and it was refused at 1,000 km.
+test('a zoom in right after a late zoom out brings the tilt back in', (t) => {
+  const h = harness(t, { height: 400_000 });
+  moveCamera({ motion: 'tilt', pitchDeg: -5 });
+  for (let i = 0; i < 70; i += 1) h.tick();
+  const range = pivotRange(h);
+  assert.equal(adjustOrbitRange(2.5).changed, true);
+  const zoomIn = adjustOrbitRange(0.4);
+  assert.equal(zoomIn.changed, true, 'the zoom in must not be refused');
+  h.finish();
+  assert.ok(
+    Math.abs(pivotRange(h) - range) < 1,
+    `range ${pivotRange(h)} m, wanted ${range} m`,
+  );
+  assert.ok(
+    centreDrift(h) < 100,
+    `crosshair ${centreDrift(h)} m off the place`,
+  );
+});

src/cameraVerbs.js

@@ -48,6 +48,33 @@ const ONCE = {
 };
 const PITCH_MIN = Cesium.Math.toRadians(-89);
 const PITCH_MAX = Cesium.Math.toRadians(-5);
+/** A bare "tilt the camera" / "oblique view" settles here. */
+const TILT_DEFAULT_PITCH_DEG = -45;
+/** °/s for a tilt to a requested angle; short ones keep the once duration. */
+const TILT_TO_DEG_S = 30;
+/**
+ * A pivoting tilt keeps the range, so its height above the pivot is
+ * range × sin|pitch|. It swings no lower than this; the rest tilts in place.
+ */
+const TILT_MIN_CLEARANCE_M = 150;
+/**
+ * Beyond this range a pivot would swing the camera thousands of km about the
+ * crosshair point, so the tilt happens in place instead.
+ */
+const TILT_PIVOT_MAX_RANGE_M = 1_000_000;
+/**
+ * A pivot range rebuilt from the camera's position comes back a hair off the
+ * range it was set at: a range this close past the cutoff still counts as on
+ * it.
+ */
+const TILT_PIVOT_RANGE_SLACK_M = 1;
+/**
+ * The shallowest a pivot swing goes when its clearance is not what stops it.
+ * From several hundred km the camera's own horizon limit lies past the
+ * place's horizon; tilting the rest in place there would lift the crosshair
+ * onto the sky, so the swing stops with the place this far above it.
+ */
+const TILT_MIN_PIVOT_ELEVATION = Cesium.Math.toRadians(0.5);
 
 /* ── Route dolly: cinematic tuning ──────────────────────────────────────────
  * Every knob an owner may want to retune lives in this block. The shaping is
@@ -966,6 +993,17 @@ let _trackingRemover = null;
 let _inputRemovers = [];
 /** Monotonic id for the motion currently running; 0 means "no motion". */
 let _motionSeq = 0;
+/** Canvas grabs, touches and wheel turns since load. */
+let _manualInputCount = 0;
+
+/**
+ * Lets a caller holding a motion back (behind a fly-to) see whether the user
+ * took the camera meanwhile; Cesium does not cancel a flight on input.
+ * @returns {number} Manual camera inputs so far.
+ */
+export function manualCameraInputCount() {
+  return _manualInputCount;
+}
 
 /**
  * Install a motion and stamp it with a fresh id. The id is what lets a caller
@@ -1052,7 +1090,9 @@ export function interruptCameraMotion(reason = 'interrupt') {
   if (
     wasActive &&
     !tracking &&
-    (_active.kind === 'orbit' || _active.kind === 'route')
+    (_active.kind === 'orbit' ||
+      _active.kind === 'route' ||
+      (_active.kind === 'tilt' && _active.hpr))
   )
     clearLookAt();
   // Instant, not eased: the user grabbed the camera, or the flight is over.
@@ -1104,7 +1144,7 @@ function onTick() {
   let scale = 1;
   if (m.mode === 'once') {
     m.elapsed = (m.elapsed || 0) + dt;
-    const t = Math.min(1, m.elapsed / ONCE.durationS);
+    const t = Math.min(1, m.elapsed / (m.durationS || ONCE.durationS));
     scale = 1 - (1 - t) * (1 - t); // ease-out progress share
     if (t >= 1) {
       interruptCameraMotion('once-complete');
@@ -1173,18 +1213,13 @@ function onTick() {
       else if (m.direction === 'right') cam.moveRight(step);
       else if (m.direction === 'up') cam.moveUp(step);
       else cam.moveDown(step);
-    } else if (
-      m.kind === 'tilt' ||
-      m.kind === 'rotate' ||
-      m.kind === 'rotate_globe'
-    ) {
+    } else if (m.kind === 'tilt') {
+      tickTilt(cam, m, scale, dt);
+    } else if (m.kind === 'rotate' || m.kind === 'rotate_globe') {
       const degS = TILT_DEG_S[m.speed];
       const stepRad =
         m.mode === 'once'
-          ? Cesium.Math.toRadians(
-              m.kind === 'tilt' ? ONCE.tiltDeg : ONCE.rotateDeg,
-            ) *
-            (scale - (m.lastScale || 0))
+          ? Cesium.Math.toRadians(ONCE.rotateDeg) * (scale - (m.lastScale || 0))
           : Cesium.Math.toRadians(degS) * dt;
       m.lastScale = scale;
       if (m.kind === 'rotate_globe') {
@@ -1218,16 +1253,6 @@ function onTick() {
           return;
         }
         cam.rotate(m.rotationAxis, angle);
-      } else if (m.kind === 'tilt') {
-        const up = m.direction === 'up';
-        // Clamp pitch to [-89°, -5°]: never through the ground, never at the sky.
-        const next = cam.pitch + (up ? stepRad : -stepRad);
-        if (next > PITCH_MAX || next < PITCH_MIN) {
-          interruptCameraMotion('tilt-clamp');
-          return;
-        }
-        if (up) cam.lookUp(stepRad);
-        else cam.lookDown(stepRad);
       } else if (m.direction === 'left') cam.lookLeft(stepRad);
       else cam.lookRight(stepRad);
     } else if (m.kind === 'route') {
@@ -1252,6 +1277,186 @@ function onTick() {
   }
 }
 
+/**
+ * One frame of tilt. With a ground pivot the camera swings about it (lookAt),
+ * so the place under the crosshair stays centred; without one it looks up or
+ * down in place. Every angle and limit is the camera's own pitch, which at
+ * regional range is several degrees steeper than the pivot's (the Earth
+ * curves away), so the swing solves for the pivot pitch that gives it. Pitch
+ * is clamped to [-89°, -5°] only in the direction of travel: a top-down view
+ * sits at -90°, below the limit, and must still be able to tilt up out of it.
+ * A pivot swing toward the horizon lowers the camera, so it stops at
+ * TILT_MIN_CLEARANCE_M and the rest tilts in place. Farther out it stops with
+ * the camera TILT_MIN_PIVOT_ELEVATION above the place's horizon instead, and
+ * keeps the place centred: tilting in place there would lift the crosshair
+ * onto the sky.
+ */
+function tickTilt(cam, m, scale, dt) {
+  const from = cam.pitch;
+  const want =
+    m.mode === 'once'
+      ? m.startPitch + (m.goalPitch - m.startPitch) * scale
+      : from +
+        Cesium.Math.toRadians(TILT_DEG_S[m.speed]) *
+          dt *
+          (m.direction === 'up' ? 1 : -1);
+  const up = want > from;
+  const limited = up
+    ? Math.min(want, Math.max(from, PITCH_MAX))
+    : Math.max(want, Math.min(from, PITCH_MIN));
+  let atLimit = false;
+  if (m.hpr) {
+    // Apply a range a zoom set since the last frame, even when the pitch
+    // then has nowhere to go (a zoom in to the clearance ends the pivot).
+    cam.lookAt(m.target, m.hpr);
+    // Up toward the horizon the swing lowers the camera: hold the clearance,
+    // and keep the place below the horizon.
+    const cap = up
+      ? Math.max(m.hpr.pitch, tiltPivotPitchMax(m.hpr.range))
+      : Infinity;
+    for (let i = 0; i < 3 && Math.abs(limited - cam.pitch) > 1e-6; i += 1) {
+      const pitch = Math.min(
+        cap,
+        Math.max(-Cesium.Math.PI_OVER_TWO, m.hpr.pitch + limited - cam.pitch),
+      );
+      if (pitch === m.hpr.pitch) break;
+      m.hpr.pitch = pitch;
+      cam.lookAt(m.target, m.hpr);
+    }
+    // A once motion that just completed released the lookAt frame before
+    // this last step re-took it.
+    if (_active !== m) clearLookAt();
+    if (up && m.hpr.pitch >= cap && cam.pitch < limited - 1e-6) {
+      if (tiltClearanceBinds(m.hpr.range)) {
+        // Down to its clearance: let go of the pivot and tilt the rest in
+        // place, which keeps the height.
+        if (_active === m) clearLookAt();
+        m.hpr = null;
+        m.target = null;
+      } else {
+        // The place is at its horizon limit: stop here, still centred.
+        atLimit = true;
+      }
+    }
+  }
+  if (!m.hpr) cam.lookUp(limited - cam.pitch);
+  if (m.mode !== 'once' && (limited !== want || atLimit))
+    interruptCameraMotion('tilt-clamp');
+}
+
+/** The refusal for a tilt up the camera has no room left for. */
+function tiltUpLimitRefusal() {
+  return {
+    ok: false,
+    action: 'move_camera',
+    error:
+      'Already at the upper tilt limit (near the horizon) — tilt down, or zoom/pan instead.',
+  };
+}
+
+/** Shallowest pivot pitch that keeps the clearance at this range. */
+function tiltPivotPitchMax(range) {
+  return Math.min(
+    -Math.asin(Math.min(1, TILT_MIN_CLEARANCE_M / range)),
+    -TILT_MIN_PIVOT_ELEVATION,
+  );
+}
+
+/**
+ * Whether the clearance, not the horizon, stops a swing at this range. Only
+ * then does the rest of the tilt happen in place: that close in (under ~17
+ * km) the camera's -5° limit stays well below its own horizon.
+ */
+function tiltClearanceBinds(range) {
+  return TILT_MIN_CLEARANCE_M / range >= Math.sin(TILT_MIN_PIVOT_ELEVATION);
+}
+
+/**
+ * The shallowest camera pitch a tilt starting from this frame can reach with
+ * the place under the crosshair still in view: PITCH_MAX, or less where a
+ * far pivot meets its horizon limit first.
+ */
+function tiltUpLimit({ target, pivot }) {
+  if (!pivot || tiltClearanceBinds(pivot.range)) return PITCH_MAX;
+  return Math.min(
+    PITCH_MAX,
+    pivotCameraPitch(
+      target,
+      pivot,
+      Math.max(pivot.pitch, tiltPivotPitchMax(pivot.range)),
+    ),
+  );
+}
+
+/** The camera pitch lookAt gives for this pivot at the given pivot pitch. */
+function pivotCameraPitch(target, { heading, range }, pitch) {
+  const offset = new Cesium.Cartesian3(
+    -range * Math.cos(pitch) * Math.sin(heading),
+    -range * Math.cos(pitch) * Math.cos(heading),
+    -range * Math.sin(pitch),
+  );
+  const eye = Cesium.Matrix4.multiplyByPoint(
+    Cesium.Transforms.eastNorthUpToFixedFrame(target),
+    offset,
+    new Cesium.Cartesian3(),
+  );
+  const look = Cesium.Cartesian3.subtract(target, eye, new Cesium.Cartesian3());
+  Cesium.Cartesian3.normalize(look, look);
+  const ellipsoid = _viewer.scene.globe?.ellipsoid ?? Cesium.Ellipsoid.WGS84;
+  const upAtEye = ellipsoid.geodeticSurfaceNormal(eye, new Cesium.Cartesian3());
+  return Math.asin(
+    Cesium.Math.clamp(Cesium.Cartesian3.dot(look, upAtEye), -1, 1),
+  );
+}
+
+/**
+ * Where a tilt starts. It swings about the ground under the crosshair so the
+ * place stays centred. It tilts in place with no ground there, from globe
+ * range, or while an entity is tracked (the follow camera owns that frame;
+ * voice releases it before moving, so a voice tilt still pivots).
+ */
+function tiltStartFrame(cam) {
+  const target = _viewer.trackedEntity ? null : _getTarget?.(_viewer);
+  let pivot = target ? tiltPivot(cam, target) : null;
+  if (pivot && !tiltPivotInReach(pivot.range)) pivot = null;
+  return { target, pivot, from: cam.pitch };
+}
+
+/** Whether a tilt may pivot at this range: up to and including the cutoff. */
+function tiltPivotInReach(range) {
+  return range <= TILT_PIVOT_MAX_RANGE_M + TILT_PIVOT_RANGE_SLACK_M;
+}
+
+/** The reply's note for a tilt the place's horizon stops short of its angle. */
+function tiltHorizonNote(pitch) {
+  return `Stopped at ${Math.round(Cesium.Math.toDegrees(pitch))}°: from this range a shallower angle puts the place past the horizon. Zoom in to tilt further.`;
+}
+
+/** Ground pivot for a tilt: heading, pitch and range in the target's own frame. */
+function tiltPivot(cam, target) {
+  const local = Cesium.Matrix4.multiplyByPoint(
+    Cesium.Matrix4.inverseTransformation(
+      Cesium.Transforms.eastNorthUpToFixedFrame(target),
+      new Cesium.Matrix4(),
+    ),
+    cam.positionWC,
+    new Cesium.Cartesian3(),
+  );
+  const range = Cesium.Cartesian3.magnitude(local);
+  if (!(range > 1) || local.z <= 0) return null;
+  // Near straight overhead the offset's heading is float noise (it flipped a
+  // north-up London view to south); keep the camera's own.
+  const heading =
+    Math.hypot(local.x, local.y) > range * 0.01
+      ? Math.atan2(-local.x, -local.y)
+      : cam.heading;
+  return new Cesium.HeadingPitchRange(
+    heading,
+    -Math.asin(Math.min(1, local.z / range)),
+    range,
+  );
+}
+
 /** Rigid origin-centred rotation stays outside the actual ellipsoid's bounding sphere. */
 function globeRotationHasClearance(position) {
   const ellipsoid = _viewer.scene.globe?.ellipsoid ?? Cesium.Ellipsoid.WGS84;
@@ -1421,18 +1626,108 @@ export function initCameraVerbs(
   _trackingRemover = viewer.trackedEntityChanged?.addEventListener((entity) => {
     if (entity && _active?.kind === 'rotate_globe')
       interruptCameraMotion('globe-camera-owner-changed');
+    // A pivoting tilt's lookAt would fight the follow camera every frame.
+    else if (entity && _active?.kind === 'tilt' && _active.hpr)
+      interruptCameraMotion('tilt-camera-owner-changed');
   });
   for (const rm of _inputRemovers) rm();
   _inputRemovers = [];
   const canvas = viewer.scene.canvas;
   // ANY manual camera input reclaims control — the cancelFlight reflex.
   for (const evt of ['pointerdown', 'touchstart', 'wheel']) {
-    const h = () => interruptCameraMotion('manual-input');
+    const h = () => {
+      _manualInputCount += 1;
+      interruptCameraMotion('manual-input');
+    };
     canvas.addEventListener(evt, h, { passive: true });
     _inputRemovers.push(() => canvas.removeEventListener(evt, h));
   }
 }
 
+/**
+ * A tilt's angle: the one asked for, the default oblique view when a bare
+ * "tilt the camera" names neither angle nor direction, or null for a nudge.
+ */
+function requestedTiltPitch(args, direction) {
+  // Only a real number or numeric text: Number('') and Number(null) are 0,
+  // which would swing the camera to the horizon.
+  const raw = args.pitchDeg;
+  const requested =
+    typeof raw === 'number' || (typeof raw === 'string' && raw.trim() !== '')
+      ? Number(raw)
+      : NaN;
+  // The camera never looks above the horizon, so a positive angle can only
+  // mean the same angle below it ("tilt 45 degrees" sent as 45).
+  if (Number.isFinite(requested))
+    return Cesium.Math.clamp(
+      Cesium.Math.toRadians(-Math.abs(requested)),
+      PITCH_MIN,
+      PITCH_MAX,
+    );
+  return direction === null
+    ? Cesium.Math.toRadians(TILT_DEFAULT_PITCH_DEG)
+    : null;
+}
+
+/**
+ * Argument errors move_camera refuses whatever the camera is doing, so a
+ * caller holding a motion back behind a flight can refuse it before waiting.
+ * @param {Object} args
+ * @returns {Object|null} The refusal, or null when the arguments are usable.
+ */
+export function moveCameraArgsError(args = {}) {
+  const motion = String(args.motion || '').toLowerCase();
+  const direction = args.direction
+    ? String(args.direction).toLowerCase()
+    : null;
+  if (motion === 'stop') return null;
+  if (!['orbit', 'pan', 'tilt', 'rotate', 'rotate_globe'].includes(motion)) {
+    return {
+      ok: false,
+      action: 'move_camera',
+      error: `Unknown motion "${args.motion}" — use orbit, pan, tilt, rotate, rotate_globe, or stop.`,
+    };
+  }
+  if (
+    motion !== 'orbit' &&
+    motion !== 'rotate_globe' &&
+    (motion !== 'tilt' || requestedTiltPitch(args, direction) === null) &&
+    !['left', 'right', 'up', 'down'].includes(direction)
+  ) {
+    return {
+      ok: false,
+      action: 'move_camera',
+      error: `${motion} needs a direction (${motion === 'tilt' ? 'up/down' : motion === 'rotate' ? 'left/right' : 'left/right/up/down'}).`,
+    };
+  }
+  if (motion === 'tilt' && (direction === 'left' || direction === 'right')) {
+    return {
+      ok: false,
+      action: 'move_camera',
+      error: 'tilt needs up or down, or pitchDeg alone for an angle.',
+    };
+  }
+  if (motion === 'rotate' && !['left', 'right'].includes(direction)) {
+    return {
+      ok: false,
+      action: 'move_camera',
+      error: 'rotate needs left or right.',
+    };
+  }
+  if (
+    motion === 'rotate_globe' &&
+    direction !== null &&
+    !['left', 'right'].includes(direction)
+  ) {
+    return {
+      ok: false,
+      action: 'move_camera',
+      error: 'rotate_globe needs left or right.',
+    };
+  }
+  return null;
+}
+
 /**
  * move_camera implementation. Returns the house result shape; rejections are
  * plain-English `ok:false` errors.
@@ -1465,54 +1760,66 @@ export function moveCamera(args = {}, runNavigation = null) {
     };
     return typeof runNavigation === 'function' ? runNavigation(stop) : stop();
   }
-  if (!['orbit', 'pan', 'tilt', 'rotate', 'rotate_globe'].includes(motion)) {
-    return {
-      ok: false,
-      action: 'move_camera',
-      error: `Unknown motion "${args.motion}" — use orbit, pan, tilt, rotate, rotate_globe, or stop.`,
-    };
-  }
-  if (
-    motion !== 'orbit' &&
-    motion !== 'rotate_globe' &&
-    !['left', 'right', 'up', 'down'].includes(direction)
-  ) {
-    return {
-      ok: false,
-      action: 'move_camera',
-      error: `${motion} needs a direction (left/right${motion !== 'rotate' ? '/up/down' : ''}).`,
-    };
-  }
-  if (motion === 'rotate' && !['left', 'right'].includes(direction)) {
-    return {
-      ok: false,
-      action: 'move_camera',
-      error: 'rotate needs left or right.',
-    };
-  }
-  if (
-    motion === 'rotate_globe' &&
-    direction !== null &&
-    !['left', 'right'].includes(direction)
-  ) {
-    return {
-      ok: false,
-      action: 'move_camera',
-      error: 'rotate_globe needs left or right.',
-    };
-  }
-  if (motion === 'tilt') {
-    // Honest limits: at the clamp a tilt is a no-op — say so instead of
-    // reporting success and letting the model gaslight itself (field test).
-    const pitch = _viewer.camera.pitch;
-    if (direction === 'up' && pitch >= PITCH_MAX - Cesium.Math.toRadians(0.5)) {
+  const argsError = moveCameraArgsError(args);
+  if (argsError) return argsError;
+  const tiltToPitch =
+    motion === 'tilt' ? requestedTiltPitch(args, direction) : null;
+  if (motion === 'tilt' && tiltToPitch !== null) {
+    // Angles and limits are the camera's own pitch, whatever the swing pivots
+    // about; releasing the follow camera does not change it.
+    const from = _viewer.camera.pitch;
+    // -89 or -90 means top-down, which a -90° view already is: the clamp
+    // must not tilt it up 1°.
+    const atTopDown = tiltToPitch <= PITCH_MIN && from <= PITCH_MIN;
+    if (
+      atTopDown ||
+      Math.abs(tiltToPitch - from) < Cesium.Math.toRadians(0.5)
+    ) {
+      // Still a camera request: it stops a running motion and releases the
+      // follow camera, as a tilt that moves would.
+      const hold = () => {
+        interruptCameraMotion('replaced');
+        return {
+          ok: true,
+          action: 'move_camera',
+          motion,
+          pitchDeg: Math.round(
+            Cesium.Math.toDegrees(atTopDown ? from : tiltToPitch),
+          ),
+          unchanged: true,
+        };
+      };
+      return typeof runNavigation === 'function' ? runNavigation(hold) : hold();
+    }
+    // pitchDeg is an absolute angle, not a step: "tilt down 10 degrees" sent
+    // as {direction:'down', pitchDeg:10} would tilt up from -45°.
+    const towards = tiltToPitch > from ? 'up' : 'down';
+    if ((direction === 'up' || direction === 'down') && direction !== towards) {
+      const target = Math.round(Cesium.Math.toDegrees(tiltToPitch));
+      const now = Math.round(Cesium.Math.toDegrees(from));
       return {
         ok: false,
         action: 'move_camera',
-        error:
-          'Already at the upper tilt limit (near the horizon) — tilt down, or zoom/pan instead.',
+        error: `pitchDeg is an absolute angle, not a step: ${target}° from ${now}° tilts ${towards}, not ${direction}. Send direction alone for a nudge, or pitchDeg alone for an angle.`,
       };
     }
+    if (
+      towards === 'up' &&
+      from >=
+        tiltUpLimit(tiltStartFrame(_viewer.camera)) - Cesium.Math.toRadians(0.5)
+    )
+      return tiltUpLimitRefusal();
+  } else if (motion === 'tilt') {
+    // Honest limits: at the clamp a tilt is a no-op — say so instead of
+    // reporting success and letting the model gaslight itself (field test).
+    const pitch = _viewer.camera.pitch;
+    if (
+      direction === 'up' &&
+      pitch >=
+        tiltUpLimit(tiltStartFrame(_viewer.camera)) - Cesium.Math.toRadians(0.5)
+    ) {
+      return tiltUpLimitRefusal();
+    }
     if (
       direction === 'down' &&
       pitch <= PITCH_MIN + Cesium.Math.toRadians(0.5)
@@ -1607,6 +1914,7 @@ export function moveCamera(args = {}, runNavigation = null) {
         error: 'Globe rotation requires a clear ellipsoid bounding sphere.',
       };
   }
+  let horizonLimited = null;
   const start = () => {
     interruptCameraMotion('replaced');
     const state = {
@@ -1615,6 +1923,43 @@ export function moveCamera(args = {}, runNavigation = null) {
       speed,
       mode,
     };
+    if (motion === 'tilt') {
+      const frame = tiltStartFrame(_viewer.camera);
+      const { target, pivot, from } = frame;
+      if (pivot) {
+        state.target = target;
+        state.hpr = pivot;
+      }
+      state.startPitch = from;
+      const upLimit = tiltUpLimit(frame);
+      if (tiltToPitch !== null) {
+        // From far out the place reaches its horizon before the camera
+        // reaches the asked angle: stop there, and say so.
+        const goal =
+          tiltToPitch > from
+            ? Math.min(tiltToPitch, Math.max(from, upLimit))
+            : tiltToPitch;
+        state.mode = 'once';
+        state.direction = goal > from ? 'up' : 'down';
+        state.goalPitch = goal;
+        // A zoom mid-tilt moves the horizon limit; it re-judges the goal
+        // against the angle asked for.
+        state.askedPitch = tiltToPitch;
+        state.durationS = Math.max(
+          ONCE.durationS,
+          Math.abs(Cesium.Math.toDegrees(goal - from)) / TILT_TO_DEG_S,
+        );
+        if (goal !== tiltToPitch) horizonLimited = goal;
+      } else {
+        // A nudge stops at the limit it travels toward.
+        const step =
+          Cesium.Math.toRadians(ONCE.tiltDeg) * (direction === 'up' ? 1 : -1);
+        state.goalPitch =
+          step > 0
+            ? Math.min(from + step, Math.max(from, upLimit))
+            : Math.max(from + step, Math.min(from, PITCH_MIN));
+      }
+    }
     if (motion === 'rotate_globe') {
       // Convert an inherited ground-target frame without changing the world
       // pose. Rotation must pivot about Earth, never the previous local target.
@@ -1633,9 +1978,11 @@ export function moveCamera(args = {}, runNavigation = null) {
     }
     if (motion === 'orbit') {
       if (_viewer.scene.tweens.length > 0) {
-        // A camera flight is in progress ("fly to X and orbit it") — ALWAYS arm
-        // and capture at the destination; a target existing right now is
-        // meaningless (the globe is always under the crosshair).
+        // A camera flight is in progress — ALWAYS arm and capture at the
+        // destination; a target existing right now is meaningless (the globe
+        // is always under the crosshair). The voice runner already holds an
+        // orbit until its own fly-to lands; this covers any other
+        // flight.
         setActiveMotion({
           kind: 'orbit',
           direction: direction || 'right',
@@ -1699,7 +2046,13 @@ export function moveCamera(args = {}, runNavigation = null) {
       motion,
       direction: state.direction,
       speed,
-      mode,
+      mode: state.mode,
+      ...(tiltToPitch !== null && {
+        pitchDeg: Math.round(
+          Cesium.Math.toDegrees(horizonLimited ?? tiltToPitch),
+        ),
+      }),
+      ...(horizonLimited !== null && { note: tiltHorizonNote(horizonLimited) }),
     };
   };
   const preserveCameraFlight =
@@ -1714,16 +2067,93 @@ export function moveCamera(args = {}, runNavigation = null) {
 /**
  * Zoom while orbiting: scale the orbit RADIUS instead of letting the zoom
  * fight the per-frame lookAt (field test: "zoom out did literally nothing").
+ * A tilt swinging about its pivot holds a range the same way.
  * @param {number} factor  >1 zooms out (radius grows), <1 zooms in.
- * @returns {boolean} true when an orbit consumed the zoom.
+ * @returns {{kind: string, changed: boolean, pitchDeg?: number,
+ *   note?: string}|null} the motion that consumed the zoom, and whether its
+ *   range moved; null when none did. A tilt to an angle whose end the new
+ *   range moves also names the angle it now ends at (pitchDeg), with a note.
  */
 export function adjustOrbitRange(factor) {
-  if (!_active || _active.kind !== 'orbit' || !_active.hpr) return false;
-  _active.hpr.range = Math.max(
-    80,
-    Math.min(5_000_000, _active.hpr.range * factor),
+  if (!_active || !['orbit', 'tilt'].includes(_active.kind) || !_active.hpr)
+    return null;
+  // A tilt's zoom in stops at the range that keeps its clearance. The limits
+  // never move a view the wrong way: a zoom in leaves a closer view in place,
+  // and a zoom out leaves a farther one.
+  const { kind, hpr } = _active;
+  const floor =
+    kind === 'tilt'
+      ? Math.max(80, TILT_MIN_CLEARANCE_M / Math.abs(Math.sin(hpr.pitch)))
+      : 80;
+  // A tilt pivots only within TILT_PIVOT_MAX_RANGE_M; farther out the swing
+  // would carry the camera thousands of km.
+  const ceiling = kind === 'tilt' ? TILT_PIVOT_MAX_RANGE_M : 5_000_000;
+  const range = hpr.range;
+  hpr.range = Math.max(
+    Math.min(floor, range),
+    Math.min(Math.max(ceiling, range), range * factor),
   );
-  return true;
+  // Under half a metre counts as not moved, as for a plain zoom.
+  const changed = Math.abs(hpr.range - range) >= 0.5;
+  return { kind, changed, ...(changed && retargetTiltAfterZoom(_active)) };
+}
+
+/**
+ * A zoom changed the range a tilt to an angle holds, and with it the place's
+ * horizon limit: aim the tilt at the angle asked for or the new limit,
+ * whichever comes first, from where the camera is now. The pivot pitch is
+ * re-solved so the new range keeps the camera's pitch, and a limit the camera
+ * is already past is eased down to rather than jumped to. Returns the end
+ * angle and a note for the reply when that end moved, otherwise nothing.
+ */
+function retargetTiltAfterZoom(m) {
+  if (m.kind !== 'tilt' || m.mode !== 'once' || m.askedPitch === undefined)
+    return {};
+  let from = _viewer.camera.pitch;
+  if (!(m.askedPitch > from)) return {};
+  if (m.hpr) {
+    // At the same pivot pitch a longer range looks down more steeply (the
+    // Earth curves away): find the pivot pitch that holds this camera pitch.
+    // It stays below the place's horizon limit (or where the pivot already
+    // was): past it the place drops behind the Earth, so a camera the zoom
+    // leaves past that limit steps down to it with the zoom.
+    const cap = Math.max(m.hpr.pitch, tiltPivotPitchMax(m.hpr.range));
+    for (let i = 0; i < 4; i += 1) {
+      const error = from - pivotCameraPitch(m.target, m.hpr, m.hpr.pitch);
+      if (Math.abs(error) < 1e-7) break;
+      const pitch = Cesium.Math.clamp(
+        m.hpr.pitch + error,
+        -Cesium.Math.PI_OVER_TWO,
+        cap,
+      );
+      if (pitch === m.hpr.pitch) break;
+      m.hpr.pitch = pitch;
+    }
+    from = Math.min(from, pivotCameraPitch(m.target, m.hpr, m.hpr.pitch));
+  }
+  const limit =
+    m.hpr && !tiltClearanceBinds(m.hpr.range)
+      ? Math.min(
+          PITCH_MAX,
+          pivotCameraPitch(m.target, m.hpr, tiltPivotPitchMax(m.hpr.range)),
+        )
+      : PITCH_MAX;
+  const goal = Math.min(m.askedPitch, limit);
+  if (Math.abs(goal - m.goalPitch) < 1e-6) return {};
+  m.goalPitch = goal;
+  m.startPitch = from;
+  m.elapsed = 0;
+  m.durationS = Math.max(
+    ONCE.durationS,
+    Math.abs(Cesium.Math.toDegrees(goal - from)) / TILT_TO_DEG_S,
+  );
+  const limited = goal !== m.askedPitch;
+  return {
+    pitchDeg: Math.round(Cesium.Math.toDegrees(goal)),
+    note: limited
+      ? tiltHorizonNote(goal)
+      : `The tilt now reaches ${Math.round(Cesium.Math.toDegrees(goal))}°.`,
+  };
 }
 
 /**

src/firstRunExperience.test.mjs

@@ -1020,6 +1020,14 @@ test('the voice TOOL SCHEMA matches the pinned contract — the mission mapping
     'noir',
   ]);
   visualStyle.enum = [...visualStyle.enum, 'snow'];
+  // Tilt to an angle adds pitchDeg and rewords direction; restore
+  // the legacy camera fields to keep the pin.
+  const camera = legacyTools.find((tool) => tool.name === 'move_camera')
+    .parameters.properties;
+  assert.equal(camera.pitchDeg.type, 'number');
+  delete camera.pitchDeg;
+  camera.direction.description =
+    'Required for pan/tilt/rotate; orbit/rotate_globe default right.';
   const block = JSON.stringify(legacyTools);
   // Re-derived for the voice layer manifest (generated layer enums, alias and
   // field hints), point-and-ask's pointer/referent arguments and the prompt

src/radioMarkup.test.mjs

@@ -232,10 +232,17 @@ test('no unchanged Realtime tool definition drifts silently', () => {
     camera.description,
     'Direct the camera like a drone operator: orbit the current view target, pan, tilt, or rotate — one bounded nudge (mode=once) or continuous motion until stopped (mode=continuous). Continuous motion also stops on any manual camera input or when a navigation tool runs. Say the RESULTING state when confirming ("Orbiting slowly"). Globe rotation (rotate_globe) spins Earth right continuously by default; explicit direction, mode and speed take precedence. It checks fit and may refuse.',
   );
+  // Tilt to an angle adds an absolute pitchDeg with its -45° default, and
+  // names tilt steps among the direction's uses; check them, then restore
+  // the legacy fields for the pin.
   assert.equal(
     camera.parameters.properties.direction.description,
-    'Required for pan/tilt/rotate; orbit/rotate_globe default right.',
+    'Pan/rotate/tilt steps; orbit/rotate_globe default right.',
   );
+  assert.equal(camera.parameters.properties.pitchDeg.type, 'number');
+  assert.match(camera.parameters.properties.pitchDeg.description, /^Absolute;/);
+  assert.match(camera.parameters.properties.pitchDeg.description, /-45 default/);
+  delete camera.parameters.properties.pitchDeg;
   assert.equal(camera.parameters.properties.mode.description, 'once = bounded eased nudge; continuous = until stop/manual input. rotate_globe defaults continuous; other motions default once.');
   camera.parameters.properties.mode.description = 'once = bounded eased nudge (default); continuous = until stop/manual input.';
   camera.parameters.properties.motion.enum =

src/ui/shellFacade.js

@@ -6,7 +6,7 @@
 export class ShellFacade {
   /** Observe camera ownership transfers through the navigation owner. */
   subscribeCameraHandoff(listener) {
-    return this._navigation.subscribeCameraHandoff(listener);
+    return this._navigation?.subscribeCameraHandoff(listener);
   }
 
   get _models3dEnabled() {

src/ui/shellFacade.test.mjs

@@ -0,0 +1,33 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { ShellFacade } from './shellFacade.js';
+
+// A shell assembled without its navigation owner (as unit tests build one
+// from the prototype) has no handoffs to report, like the facade's other
+// optional owners; the voice runner subscribes as it is created.
+test('camera handoffs without a navigation owner subscribe to nothing', () => {
+  const shell = Object.create(ShellFacade.prototype);
+  assert.equal(
+    shell.subscribeCameraHandoff(() => {}),
+    undefined,
+  );
+});
+
+test('camera handoffs reach listeners through the navigation owner', () => {
+  const listeners = new Set();
+  const shell = Object.create(ShellFacade.prototype);
+  shell._navigation = {
+    subscribeCameraHandoff(listener) {
+      listeners.add(listener);
+      return () => listeners.delete(listener);
+    },
+  };
+  let handoffs = 0;
+  const unsubscribe = shell.subscribeCameraHandoff(() => {
+    handoffs += 1;
+  });
+  for (const listener of listeners) listener();
+  assert.equal(handoffs, 1);
+  unsubscribe();
+  assert.equal(listeners.size, 0);
+});

src/voice/actionSchemas.js

@@ -753,6 +753,7 @@ const schemas = [
           type: 'string',
           enum: ['once', 'continuous'],
         },
+        pitchDeg: { type: 'number' },
       },
       required: ['motion'],
     },

src/voice/actionSchemas.test.mjs

@@ -56,7 +56,9 @@ test('the complete Realtime tool payload pins the manifest-generated layer relea
     // area scopes and the osm-places layer; natural-region candidates and the
     // tightened area tool wording follow review.
     // control_cockpit states the own-layer entry rule (Contacts not required).
-    '9522ff6f6d640bede81c51cea6b9601439b08becc5bc20b7355aec24feb17e8d',
+    // move_camera tilt takes an optional pitchDeg angle, described as
+    // absolute with its -45 default, with steps sent as a direction.
+    '6a0d154e68beb787c4e20f12d29a5c86577dc343f3e71d8b5651998ea45d8c3c',
   );
 });
 
@@ -175,6 +177,8 @@ test('all legacy action arguments are byte-identical after removing the delibera
     'stop',
   ]);
   motion.enum = motion.enum.filter((value) => value !== 'rotate_globe');
+  // Tilt to an angle is additive.
+  delete property('move_camera').pitchDeg;
   const panels = property('set_panel_open').panelId;
   panels.enum = panels.enum.filter(
     (id) =>
@@ -320,3 +324,15 @@ test('direct voice timeout schema accepts None and exact integers, rejects malfo
   for (const minutes of [-1, 61, 1.5, '5'])
     assert.ok(validateArgs(tool.parameters, { minutes }).length > 0);
 });
+
+test('tilt accepts an angle with no direction', () => {
+  const schema = GEV_ACTION_SCHEMAS.find(
+    (tool) => tool.name === 'move_camera',
+  ).parameters;
+  assert.deepEqual(validateArgs(schema, { motion: 'tilt', pitchDeg: -45 }), []);
+  assert.deepEqual(validateArgs(schema, { motion: 'tilt' }), []);
+  // No range in the schema (prompt budget): the runner clamps to -89..-5.
+  assert.ok(
+    validateArgs(schema, { motion: 'tilt', pitchDeg: 'steep' }).length > 0,
+  );
+});

src/voice/geminiSession.js

@@ -184,6 +184,9 @@ export class GeminiSessionController {
     this.model = null;
     this.epoch = 0;
     this.turn = 0;
+    // Identifies one turn's tool calls to the runner as one reply; a new
+    // object each turn, so no two sessions or turns share it.
+    this.turnReply = {};
     this.globeToolsBlocked = false;
     this.globeResetFailed = false;
     this.inputGeneration = 0;
@@ -971,6 +974,7 @@ export class GeminiSessionController {
     const tools = [...this.tools.values()];
     this.turnAbort = new AbortController();
     this.turn++;
+    this.turnReply = {};
     this.typedIntent = null;
     this.radioStrongerCommit = null;
     this.pruneControls();
@@ -1544,6 +1548,7 @@ export class GeminiSessionController {
     )
       throw new Error(msg('Gemini requested too many simultaneous actions'));
     const turn = this.turn;
+    const reply = this.turnReply;
     this.userTurnPending = false;
     this.modelComplete = false;
     // Admit each valid native call ID once per connection.
@@ -1565,6 +1570,7 @@ export class GeminiSessionController {
       const action = new AbortController();
       action.call = { id: call.id, name: call.name };
       action.sequence = ++this.toolSequence;
+      action.reply = reply;
       this.tools.set(call.id, action);
       const priorTools = this.toolQueue;
       const args =
@@ -1674,6 +1680,9 @@ export class GeminiSessionController {
         this.runAction(call.name, args, {
           signal: toolSignal,
           callId: call.id,
+          // Calls run one by one, so a motion can follow a fly-to of the
+          // same reply that already found nothing.
+          reply: action.reply,
           progress: (update) => {
             if (actionCurrent()) this.narration.progress(call.id, update);
           },

src/voice/geminiSession.test.mjs

@@ -1241,6 +1241,34 @@ test('successful stronger Radio stop still invalidates the prepared group', asyn
   h.c.stop();
 });
 
+test('Gemini tools of one turn share a reply identity, and a new turn gets another', async () => {
+  const replies = [];
+  const h = harness({
+    runAction: (name, _args, next) => {
+      replies.push([name, next.reply]);
+      return { ok: true, action: name };
+    },
+  });
+  await h.c.start({ pushToTalk: true });
+  h.c.sendTextCommand('Fly to Xyzzyville and pan left');
+  const ws = h.sockets[0];
+  requestTool(ws, 'fly', 'fly_to_location', { query: 'Xyzzyville' });
+  requestTool(ws, 'pan', 'move_camera', { motion: 'pan', direction: 'left' });
+  await h.c.toolQueue;
+  assert.equal(replies.length, 2);
+  assert.ok(replies[0][1], 'a sequentially run call carries its reply');
+  assert.equal(replies[1][1], replies[0][1]);
+  drainRadioReply(h);
+  await tick();
+  assert.equal(h.c.sendTextCommand('Pan left'), true);
+  requestTool(ws, 'pan-2', 'move_camera', { motion: 'pan', direction: 'left' });
+  await h.c.toolQueue;
+  assert.equal(replies.length, 3);
+  assert.ok(replies[2][1]);
+  assert.notEqual(replies[2][1], replies[0][1]);
+  h.c.stop();
+});
+
 test('slow Gemini tools reuse shared progress timing without injecting a conversation turn', async () => {
   const pending = deferred();
   let options;

src/voice/gevActions.js

@@ -47,6 +47,9 @@ import {
   flyRoute,
   interruptCameraMotion,
   adjustOrbitRange,
+  manualCameraInputCount,
+  moveCameraArgsError,
+  getActiveCameraMotion,
 } from '../cameraVerbs.js';
 import * as defaultFloorServices from '../data/groundFloor.js';
 import { isPickedWorldPosition } from '../data/scenePick.js';
@@ -286,6 +289,28 @@ export function createGevActionRunner({
     ? { ...SPEECH_BUILDERS, ...speechBuilders }
     : SPEECH_BUILDERS;
   const _layerEnabledAt = new Map();
+  // The latest voice flight. A tilt, orbit, pan or rotate in the same reply
+  // as "fly to X" waits for it to land: run at once, its navigation
+  // cancelled the flight, or the flight (still geocoding) then replaced the
+  // motion. The wait follows later fly-tos (voiceFlightTarget).
+  let voiceFlight = null;
+  // Waiters to tell when a newer voice flight begins.
+  const voiceFlightWatchers = new Set();
+  // Camera handoffs (navigation stamps) seen, and how many of them voice
+  // fly-tos made. A search, share link or import that stamps during a flight
+  // leaves it flying; the motion queued behind it then yields to that one.
+  // The voice fly-tos of the latest reply that sent one: whether any moved
+  // the camera, and whether one found nothing. A motion of that reply run
+  // after its fly-to found nothing (Gemini runs a reply's calls one by one)
+  // has no flight to wait on, and must not move the old view instead.
+  let replyFlights = null;
+  let cameraHandoffs = 0;
+  let voiceFlightHandoffs = 0;
+  const otherHandoffs = () => cameraHandoffs - voiceFlightHandoffs;
+  const unsubscribeCameraHandoff =
+    styleManager?.subscribeCameraHandoff?.(() => {
+      cameraHandoffs += 1;
+    }) ?? null;
   let analystEngine;
   // Area handles live for this runner (the page): resolve_area, the
   // analyst's region/area/drawn scopes, find_imagery and osm_query all read
@@ -427,13 +452,30 @@ export function createGevActionRunner({
       const zoomOut = String(args.direction || '').toLowerCase() === 'out';
       const amt = String(args.amount || 'medium').toLowerCase();
       const factor = { little: 1.25, medium: 1.6, lot: 2.4 }[amt] || 1.6;
-      if (adjustOrbitRange(zoomOut ? factor : 1 / factor)) {
+      const held = adjustOrbitRange(zoomOut ? factor : 1 / factor);
+      if (held) {
+        const direction = zoomOut ? 'out' : 'in';
+        if (!held.changed) {
+          return {
+            ok: false,
+            action: 'adjust_camera_zoom',
+            direction,
+            amount: amt,
+            error: `Not zoomed: the ${held.kind} is already at its ${zoomOut ? 'farthest' : 'closest'} range.`,
+          };
+        }
         return {
           ok: true,
           action: 'adjust_camera_zoom',
-          direction: zoomOut ? 'out' : 'in',
+          direction,
           amount: amt,
-          orbitRadiusAdjusted: true,
+          [held.kind === 'tilt' ? 'tiltRangeAdjusted' : 'orbitRadiusAdjusted']:
+            true,
+          // A tilt to an angle names the angle the new range now ends it at.
+          ...(held.pitchDeg !== undefined && {
+            pitchDeg: held.pitchDeg,
+            note: held.note,
+          }),
         };
       }
     }
@@ -1125,34 +1167,104 @@ export function createGevActionRunner({
           runOptions,
         );
       }
-      return flyToRequestedLocation(viewer, args, {
+      // Chained fly-tos: a grab during an earlier one still flying counts.
+      // The flight replaced is the last one that moved, past lookups that
+      // found nothing.
+      const prior = voiceFlightTarget(voiceFlight);
+      const flight = trackVoiceFlight(
+        prior && !prior.done ? prior.inputCount : undefined,
+        prior,
+      );
+      // Navigation by anything but a voice fly-to since this one began.
+      flight.handoffs = otherHandoffs();
+      voiceFlight = flight;
+      const reply = voiceReplyOf(runOptions);
+      if (reply !== null && replyFlights?.reply !== reply)
+        replyFlights = { reply, moved: false, foundNothing: false };
+      const replyRecord = reply !== null ? replyFlights : null;
+      for (const notify of [...voiceFlightWatchers]) notify();
+      // A motion already running (one the model sent before this fly-to) is
+      // stopped when the flight takes navigation; the result says so.
+      let stoppedMotion = null;
+      const noteStop =
+        (hook) =>
+        (...hookArgs) => {
+          const before = getActiveCameraMotion();
+          const handoffsBefore = cameraHandoffs;
+          try {
+            return hook(...hookArgs);
+          } finally {
+            // A voice fly-to's own stamps are not another navigation, even
+            // for the flight it replaces (a later lookup may find nothing).
+            voiceFlightHandoffs += cameraHandoffs - handoffsBefore;
+            if (
+              before &&
+              !stoppedMotion &&
+              getActiveCameraMotion()?.motionId !== before.motionId
+            )
+              stoppedMotion = before.kind;
+          }
+        };
+      const flown = flyToRequestedLocation(viewer, args, {
+        onFlightEnd: flight.settle,
         onProgress: reportProgress,
         placeSearch,
         searchNavigation,
         signal: runOptions.signal,
         runImmediate:
           typeof styleManager?.runImmediateLocationNavigation === 'function'
-            ? (navigate) =>
-                styleManager.runImmediateLocationNavigation(navigate)
+            ? noteStop((navigate) =>
+                styleManager.runImmediateLocationNavigation(navigate),
+              )
             : null,
         beginDeferred:
           typeof styleManager?.beginDeferredLocationNavigation === 'function'
-            ? () => styleManager.beginDeferredLocationNavigation()
+            ? noteStop(() => styleManager.beginDeferredLocationNavigation())
             : null,
         reassertDeferred:
           typeof styleManager?.reassertDeferredLocationNavigation === 'function'
-            ? (generation) =>
-                styleManager.reassertDeferredLocationNavigation(generation)
+            ? noteStop((generation) =>
+                styleManager.reassertDeferredLocationNavigation(generation),
+              )
             : null,
-        onStart: () => {
+        onStart: noteStop(() => {
           if (typeof styleManager?.beginLocationNavigation === 'function') {
             styleManager.beginLocationNavigation();
             return;
           }
           interruptCameraMotion('nav:fly_to_location');
           if (viewer.trackedEntity) stopAllTracking(viewer, dataManager);
-        },
+        }),
       });
+      // No flight started: nothing to wait for. A lookup that was not found,
+      // threw, or was cancelled once a newer voice fly-to had begun (which
+      // takes navigation from it) moved nothing, so a queued motion looks
+      // past it to the flight it replaced. One cancelled while still the
+      // latest voice flight lost navigation to something else (a search, a
+      // share link, Cockpit): the motion then refuses. A flight its own hooks
+      // already settled (cancelled mid-air) keeps its status.
+      const notStarted = () => {
+        if (!flight.done) flight.movedNothing = true;
+        flight.settle('failed');
+      };
+      flown.then((result) => {
+        if (result?.ok === true) return;
+        if (result?.cancelled && voiceFlight === flight)
+          flight.settle('failed');
+        else notStarted();
+      }, notStarted);
+      // After the outcome above, which marks a lookup that moved nothing.
+      const noteReply = (result) => {
+        if (!replyRecord) return;
+        if (result?.ok === true) replyRecord.moved = true;
+        else if (flight.movedNothing) replyRecord.foundNothing = true;
+      };
+      flown.then(noteReply, () => noteReply(null));
+      return flown.then((result) =>
+        stoppedMotion && result && typeof result === 'object'
+          ? { ...result, stoppedMotion }
+          : result,
+      );
     }
 
     if (name === 'adjust_camera_zoom') {
@@ -1254,6 +1366,85 @@ export function createGevActionRunner({
     }
 
     if (name === 'move_camera') {
+      const motion = String(args.motion || '').toLowerCase();
+      // A lookup that already found nothing does not hide the last flight
+      // that moved: running now would cancel that flight mid-air.
+      const pending = voiceFlightTarget(voiceFlight);
+      const reply = voiceReplyOf(runOptions);
+      if (
+        VOICE_FLIGHT_WAITING_MOTIONS.has(motion) &&
+        !(pending && !pending.done) &&
+        reply !== null &&
+        replyFlights?.reply === reply &&
+        replyFlights.foundNothing &&
+        !replyFlights.moved
+      )
+        return {
+          ok: false,
+          action: 'move_camera',
+          motion,
+          error: `Not run: the fly-to in this reply found nothing, so the ${motion} was not run at the old view.`,
+        };
+      if (
+        VOICE_FLIGHT_WAITING_MOTIONS.has(motion) &&
+        pending &&
+        !pending.done
+      ) {
+        // Bad arguments are refused now, not after waiting on the flight.
+        const argsError = moveCameraArgsError(args);
+        if (argsError) return argsError;
+        const deadline = Date.now() + VOICE_FLIGHT_WAIT_MS;
+        const start = pending;
+        // Act on where the camera lands. Whatever a flight reports, a later
+        // fly-to replaces it, and the wait moves to that one as soon as it
+        // begins (a stalled geocode must not hold the motion past a newer
+        // flight that landed). A geocode that loses navigation reports
+        // failed, and a flight left flying while the next place is looked up
+        // can still land; running there would take navigation and cancel the
+        // newer one. A later lookup that found nothing moved nothing, so the
+        // motion looks past it to the last flight that did move the camera.
+        let flight = start;
+        let status;
+        for (;;) {
+          status = await waitForVoiceFlight(
+            flight,
+            runOptions.signal,
+            deadline,
+            voiceFlightWatchers,
+          );
+          if (status === 'aborted' || status === 'timeout' || !current()) break;
+          const target = voiceFlightTarget(voiceFlight, start);
+          if (!target || (target === flight && status !== 'newer')) break;
+          flight = target;
+        }
+        if (!current())
+          return { ok: false, action: 'move_camera', cancelled: true };
+        if (status !== 'arrived' || flight.movedNothing)
+          return {
+            ok: false,
+            action: 'move_camera',
+            motion,
+            error: `Not run: the flight this ${motion} was waiting for did not arrive.`,
+          };
+        // The flight lands even when the user grabs the globe mid-flight;
+        // the queued motion must not take the camera back from them.
+        if (manualCameraInputCount() !== flight.inputCount)
+          return {
+            ok: false,
+            action: 'move_camera',
+            motion,
+            error: `Not run: the user moved the camera during the flight, so the ${motion} was dropped.`,
+          };
+        // A search, share link or import that took navigation during the
+        // flight leaves it flying; running now would cancel that navigation.
+        if (otherHandoffs() !== flight.handoffs)
+          return {
+            ok: false,
+            action: 'move_camera',
+            motion,
+            error: `Not run: another navigation took the camera during the flight, so the ${motion} was dropped.`,
+          };
+      }
       return moveCamera(args, (navigate, releaseOptions) =>
         runManagedVoiceNavigation(
           styleManager,
@@ -1569,6 +1760,7 @@ export function createGevActionRunner({
    * forget the analyst's "last answer". Area handles stay (page lifetime).
    */
   runVoiceAction.resetConversation = () => {
+    replyFlights = null;
     conversationAbort.abort();
     conversationAbort = new AbortController();
     conversation++;
@@ -1582,6 +1774,7 @@ export function createGevActionRunner({
     if (disposed) return;
     runVoiceAction.resetConversation();
     disposed = true;
+    unsubscribeCameraHandoff?.();
     voiceAreas.dispose();
   };
   return runVoiceAction;
@@ -2854,6 +3047,116 @@ async function frameOverhead(viewer, dataManager, styleManager, args = {}) {
   );
 }
 
+let voiceFlightCount = 0;
+
+/**
+ * The model reply a voice call belongs to: Gemini's turn (`reply`), or the
+ * OpenAI response its sibling calls share (`authorityGroup`). Null when the
+ * caller names none.
+ */
+function voiceReplyOf(options) {
+  return options?.reply ?? options?.authorityGroup ?? null;
+}
+
+/**
+ * A voice flight's end: 'arrived', 'cancelled' or 'failed', settled once.
+ * `replaced` is the last flight that moved when this one began (past lookups
+ * that found nothing), landed or not. It is kept only while this one may turn
+ * out to have moved nothing (a lookup that found no place), so a queued
+ * motion can look past it to that flight and its outcome.
+ */
+function trackVoiceFlight(
+  inputCount = manualCameraInputCount(),
+  replaced = null,
+) {
+  const flight = {
+    done: false,
+    seq: (voiceFlightCount += 1),
+    replaced,
+    movedNothing: false,
+    // Manual input after this means the user took the camera mid-flight.
+    inputCount,
+    status: null,
+    // Waiters to tell when this flight ends.
+    watchers: new Set(),
+    settle: (status) => {
+      if (flight.done) return;
+      flight.done = true;
+      flight.status = status;
+      // Kept only past a lookup that found nothing, and then straight to the
+      // flight that moved, so a run of such lookups holds no chain.
+      flight.replaced = flight.movedNothing
+        ? voiceFlightTarget(flight.replaced)
+        : null;
+      for (const notify of [...flight.watchers]) notify(status);
+      flight.watchers.clear();
+    },
+  };
+  return flight;
+}
+
+/**
+ * The flight a motion queued since `start` acts on: the latest one that
+ * actually started. A lookup that found nothing moved nothing, so look past
+ * it to the flight it replaced, but never to one older than `start` (a flight
+ * from an earlier reply). Null when every later lookup found nothing. With
+ * no `start`, the latest flight that started, back through lookups that
+ * found nothing.
+ */
+function voiceFlightTarget(latest, start = null) {
+  let flight = latest;
+  while (flight?.movedNothing) flight = flight.replaced;
+  return flight && (!start || flight.seq >= start.seq) ? flight : null;
+}
+
+/**
+ * Longest a motion waits for its flight (geocode plus flight, which is about
+ * 2 s) before giving up. The wait also holds the tool output, and on Gemini
+ * the later tools in the turn.
+ */
+const VOICE_FLIGHT_WAIT_MS = 15_000;
+
+/**
+ * Motions that act on the place the camera ends up at, so one sent beside a
+ * fly-to waits for it. Stop is not one, and rotate_globe turns the
+ * whole Earth from Globe View rather than at a place.
+ */
+const VOICE_FLIGHT_WAITING_MOTIONS = new Set([
+  'tilt',
+  'orbit',
+  'pan',
+  'rotate',
+]);
+
+/**
+ * Wait for a voice flight to end, or for a newer one to begin ('newer'):
+ * 'timeout' or 'aborted' if neither happens. A flight that has ended answers
+ * at once. Every listener is removed when the wait ends, so a flight that
+ * never settles holds nothing.
+ */
+function waitForVoiceFlight(flight, signal, deadline, newerWatchers) {
+  if (signal?.aborted) return Promise.resolve('aborted');
+  if (flight.done) return Promise.resolve(flight.status);
+  return new Promise((resolve) => {
+    const finish = (status) => {
+      clearTimeout(timer);
+      signal?.removeEventListener?.('abort', onAbort);
+      flight.watchers.delete(finish);
+      newerWatchers?.delete(onNewer);
+      resolve(status);
+    };
+    const onAbort = () => finish('aborted');
+    const onNewer = () => finish('newer');
+    const timer = setTimeout(
+      () => finish('timeout'),
+      Math.max(0, deadline - Date.now()),
+    );
+    signal?.addEventListener?.('abort', onAbort, { once: true });
+    flight.watchers.add(finish);
+    newerWatchers?.add(onNewer);
+  });
+}
+
 /** Run one validated voice camera mutation through the UI-owned authority seam. */
 function runManagedVoiceNavigation(
   styleManager,
@@ -3417,6 +3720,7 @@ async function flyToRequestedLocation(
     runImmediate = null,
     beginDeferred = null,
     reassertDeferred = null,
+    onFlightEnd = null,
   } = {},
 ) {
   const requestedRangeM = Number(args.rangeM);
@@ -3440,12 +3744,19 @@ async function flyToRequestedLocation(
           settleArrival = resolve;
         })
       : null;
-  const arrivalHooks = arrival
-    ? {
-        onComplete: () => settleArrival?.('arrived'),
-        onCancel: () => settleArrival?.('cancelled'),
-      }
-    : {};
+  const arrivalHooks =
+    arrival || onFlightEnd
+      ? {
+          onComplete: () => {
+            settleArrival?.('arrived');
+            onFlightEnd?.('arrived');
+          },
+          onCancel: () => {
+            settleArrival?.('cancelled');
+            onFlightEnd?.('cancelled');
+          },
+        }
+      : {};
   const afterArrival = async (result, label) => {
     if (!arrival || result?.ok !== true) return result;
     onProgress('fly', label);

src/voice/gevActions.test.mjs

@@ -143,6 +143,14 @@ test('track_entity runner narrates a callsign-less aircraft by its registration'
 function createVoiceNavigationHarness({ cockpitActive = false } = {}) {
   const order = [];
   let generation = 0;
+  // Camera handoffs, published on every navigation stamp as the shell does.
+  const handoffListeners = new Set();
+  const stamp = (noun) => {
+    generation += 1;
+    order.push(`stamp:${noun}`);
+    for (const listener of [...handoffListeners]) listener({ generation });
+    return generation;
+  };
   const position = Cesium.Cartesian3.fromDegrees(-97.74, 30.26, 500);
   const viewer = {
     trackedEntity: { id: 'prior-aircraft' },
@@ -179,11 +187,7 @@ function createVoiceNavigationHarness({ cockpitActive = false } = {}) {
       return runExplicitNavigation({
         cockpitActive,
         noun,
-        stamp: () => {
-          generation += 1;
-          order.push(`stamp:${noun}`);
-          return generation;
-        },
+        stamp: () => stamp(noun),
         release: () => {
           order.push('release');
           viewer.trackedEntity = undefined;
@@ -195,12 +199,21 @@ function createVoiceNavigationHarness({ cockpitActive = false } = {}) {
       });
     },
     getDetectionState: () => ({ detectionMode: 'DENSE' }),
+    subscribeCameraHandoff(listener) {
+      handoffListeners.add(listener);
+      return () => handoffListeners.delete(listener);
+    },
+    // A voice lookup stamps when it begins and leaves any flight flying.
+    beginDeferredLocationNavigation: () => stamp('location-lookup'),
+    reassertDeferredLocationNavigation: (stamped) => stamped === generation,
   };
   return {
     order,
     viewer,
     styleManager,
     currentGeneration: () => generation,
+    // A location-panel search: a deferred stamp that leaves a flight flying.
+    panelSearch: () => stamp('panel-search'),
   };
 }
 
@@ -276,6 +289,841 @@ test('dependent voice navigation waits for the destination viewport to arrive',
   assert.equal(result.arrived, true);
 });
 
+// "fly to London and tilt the camera" arrives as two sibling calls.
+// Run at once, the tilt's navigation cancelled the flight; with a geocoded
+// place, the late flight replaced the tilt.
+function tiltAfterFlightHarness() {
+  globalThis.window = globalThis.window || { clearTimeout, setTimeout, requestIdleCallback: null };
+  const harness = createVoiceNavigationHarness();
+  const { viewer, styleManager } = harness;
+  const flights = [];
+  viewer.camera.flyTo = (options) => {
+    harness.order.push('fly');
+    flights.push(options);
+  };
+  styleManager.runImmediateLocationNavigation = (navigate) => (
+    styleManager.runImmediateNavigation('location', navigate)
+  );
+  return { ...harness, flights };
+}
+
+const settledYet = (promise) => {
+  let settled = false;
+  promise.then(() => { settled = true; });
+  return () => settled;
+};
+
+test('a tilt in the same reply as a fly-to waits for the flight to land', async () => {
+  const { viewer, styleManager, order, flights } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  const fly = await runner('fly_to_location', { locationId: 'austin' });
+  assert.equal(fly.ok, true);
+  const tilt = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  const tiltDone = settledYet(tilt);
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal(tiltDone(), false, 'the tilt must wait while the camera flies');
+  assert.equal(
+    order.slice(order.indexOf('fly')).includes('cancel'),
+    false,
+    'the tilt must not cancel the flight',
+  );
+  flights[0].complete();
+  const result = await tilt;
+  assert.equal(result.ok, true);
+  assert.equal(result.motion, 'tilt');
+});
+
+test('a tilt waits through a geocoded fly-to search, then for its flight', async () => {
+  const { viewer, styleManager } = tiltAfterFlightHarness();
+  let finishSearch;
+  let landFlight;
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+      finishSearch = () => {
+        landFlight = options.onComplete;
+        resolve({ label: query, navigationMode: 'city-overview' });
+      };
+    }),
+  });
+  const fly = runner('fly_to_location', { query: 'Somewhere Far' });
+  const tilt = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  const tiltDone = settledYet(tilt);
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal(tiltDone(), false, 'the tilt must wait for the place lookup');
+  finishSearch();
+  assert.equal((await fly).ok, true);
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal(tiltDone(), false, 'the tilt must wait for the flight too');
+  landFlight();
+  assert.equal((await tilt).ok, true);
+});
+
+test('a tilt waiting on a flight that never lands is not run', async () => {
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  await runner('fly_to_location', { locationId: 'austin' });
+  const tilt = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  flights[0].cancel();
+  const result = await tilt;
+  assert.equal(result.ok, false);
+  assert.match(result.error, /did not arrive/);
+});
+
+test('a tilt beside a fly-to that found nothing is not run', async () => {
+  const { viewer, styleManager } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: async () => null,
+  });
+  const fly = runner('fly_to_location', { query: 'Nowhere' });
+  const tilt = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  assert.equal((await fly).ok, false);
+  // Nothing flew: the tilt answers at once and honestly, never at the old view.
+  const result = await tilt;
+  assert.equal(result.ok, false);
+  assert.match(result.error, /did not arrive/);
+  // A later, separate tilt is not held by the failed lookup.
+  assert.equal((await runner('move_camera', { motion: 'tilt', pitchDeg: -45 })).ok, true);
+});
+
+test('a tilt with no voice flight pending runs at once', async () => {
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  await runner('fly_to_location', { locationId: 'austin' });
+  flights[0].complete();
+  const result = await runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  assert.equal(result.ok, true);
+});
+
+// Orbit, pan and rotate also act at the place the camera ends up, so "fly to
+// Paris and orbit it" holds the orbit the same way.
+for (const motion of [
+  { motion: 'orbit' },
+  { motion: 'pan', direction: 'left' },
+  { motion: 'rotate', direction: 'right' },
+]) {
+  test(`${motion.motion} in the same reply as a fly-to waits for the flight to land`, async (t) => {
+    t.after(() => interruptCameraMotion('test-cleanup'));
+    const { viewer, styleManager, order, flights } = tiltAfterFlightHarness();
+    const runner = createGevActionRunner({
+      viewer,
+      styleManager,
+      dataManager: { layers: new Map(), getAll: () => [] },
+    });
+    assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+    const moved = runner('move_camera', motion);
+    const movedDone = settledYet(moved);
+    await new Promise((resolve) => setTimeout(resolve, 0));
+    assert.equal(movedDone(), false, `the ${motion.motion} must wait while the camera flies`);
+    assert.equal(
+      order.slice(order.indexOf('fly')).includes('cancel'),
+      false,
+      `the ${motion.motion} must not cancel the flight`,
+    );
+    flights[0].complete();
+    const result = await moved;
+    assert.equal(result.ok, true);
+    assert.equal(result.motion, motion.motion);
+  });
+
+  test(`${motion.motion} waits through a geocoded fly-to search, then for its flight`, async (t) => {
+    t.after(() => interruptCameraMotion('test-cleanup'));
+    const { viewer, styleManager } = tiltAfterFlightHarness();
+    let finishSearch;
+    let landFlight;
+    const runner = createGevActionRunner({
+      viewer,
+      styleManager,
+      dataManager: { layers: new Map(), getAll: () => [] },
+      searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+        finishSearch = () => {
+          landFlight = options.onComplete;
+          resolve({ label: query, navigationMode: 'city-overview' });
+        };
+      }),
+    });
+    const fly = runner('fly_to_location', { query: 'Somewhere Far' });
+    const moved = runner('move_camera', motion);
+    const movedDone = settledYet(moved);
+    await new Promise((resolve) => setTimeout(resolve, 0));
+    assert.equal(movedDone(), false, `the ${motion.motion} must wait for the place lookup`);
+    assert.equal(getActiveCameraMotion(), null, 'nothing moves before the flight');
+    finishSearch();
+    assert.equal((await fly).ok, true);
+    await new Promise((resolve) => setTimeout(resolve, 0));
+    assert.equal(movedDone(), false, `the ${motion.motion} must wait for the flight too`);
+    landFlight();
+    assert.equal((await moved).ok, true);
+    assert.equal(getActiveCameraMotion()?.kind, motion.motion);
+  });
+
+  test(`${motion.motion} waiting on a flight that never lands is not run`, async () => {
+    const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+    const runner = createGevActionRunner({
+      viewer,
+      styleManager,
+      dataManager: { layers: new Map(), getAll: () => [] },
+    });
+    await runner('fly_to_location', { locationId: 'austin' });
+    const moved = runner('move_camera', motion);
+    flights[0].cancel();
+    const result = await moved;
+    assert.equal(result.ok, false);
+    assert.equal(result.motion, motion.motion);
+    assert.match(result.error, new RegExp(`this ${motion.motion} was waiting for did not arrive`));
+    assert.equal(getActiveCameraMotion(), null);
+  });
+}
+
+// Cesium lands a flight even when the user grabs the globe mid-flight, so the
+// motion queued behind it must not then take the camera back.
+for (const motion of [
+  { motion: 'orbit' },
+  { motion: 'tilt', pitchDeg: -45 },
+]) {
+  test(`${motion.motion} queued behind a fly-to is dropped when the user drags mid-flight`, async () => {
+    const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+    const canvasListeners = new Map();
+    viewer.scene.canvas.addEventListener = (type, listener) => {
+      canvasListeners.set(type, listener);
+    };
+    const runner = createGevActionRunner({
+      viewer,
+      styleManager,
+      dataManager: { layers: new Map(), getAll: () => [] },
+    });
+    assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+    const moved = runner('move_camera', motion);
+    canvasListeners.get('pointerdown')();
+    flights[0].complete();
+    const result = await moved;
+    assert.equal(result.ok, false);
+    assert.equal(result.motion, motion.motion);
+    assert.match(result.error, /moved the camera during the flight/);
+    assert.equal(getActiveCameraMotion(), null);
+  });
+}
+
+test('a drag during the first of two chained fly-tos still drops the queued motion', async () => {
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const canvasListeners = new Map();
+  viewer.scene.canvas.addEventListener = (type, listener) => {
+    canvasListeners.set(type, listener);
+  };
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  canvasListeners.get('touchstart')();
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'orbit' });
+  flights.at(-1).complete();
+  const result = await moved;
+  assert.equal(result.ok, false);
+  assert.match(result.error, /moved the camera during the flight/);
+});
+
+test('input before a fly-to does not drop the motion queued behind it', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const canvasListeners = new Map();
+  viewer.scene.canvas.addEventListener = (type, listener) => {
+    canvasListeners.set(type, listener);
+  };
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  canvasListeners.get('wheel')();
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'orbit' });
+  flights[0].complete();
+  assert.equal((await moved).ok, true);
+});
+
+test('a motion follows a later fly-to in the same reply that cancels its flight', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'orbit' });
+  const movedDone = settledYet(moved);
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  // The second flight supersedes the first, as Cesium's flyTo does.
+  flights[0].cancel();
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal(movedDone(), false, 'the orbit must wait for the second flight');
+  flights[1].complete();
+  const result = await moved;
+  assert.equal(result.ok, true);
+  assert.equal(result.motion, 'orbit');
+});
+
+test('a motion follows a later fly-to whose start cancels its geocode', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager } = tiltAfterFlightHarness();
+  const searches = [];
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+      searches.push({ query, options, resolve });
+    }),
+  });
+  const flyA = runner('fly_to_location', { query: 'Place A' });
+  const moved = runner('move_camera', { motion: 'orbit' });
+  const movedDone = settledYet(moved);
+  const flyB = runner('fly_to_location', { query: 'Place B' });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  // B takes navigation authority, so A's lookup comes back cancelled.
+  searches[0].resolve({ cancelled: true });
+  assert.equal((await flyA).cancelled, true);
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal(movedDone(), false, 'the orbit must follow B, not drop');
+  searches[1].resolve({ label: 'Place B', navigationMode: 'city-overview' });
+  assert.equal((await flyB).ok, true);
+  searches[1].options.onComplete();
+  const result = await moved;
+  assert.equal(result.ok, true);
+  assert.equal(result.motion, 'orbit');
+});
+
+test('a motion does not run at a flight that lands while the next place is looked up', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, order, flights } = tiltAfterFlightHarness();
+  const searches = [];
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+      searches.push({ query, options, resolve });
+    }),
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  const movedDone = settledYet(moved);
+  const flyB = runner('fly_to_location', { query: 'Place B' });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  // Deferred navigation leaves A flying while B is looked up, and A lands.
+  const before = order.length;
+  flights[0].complete();
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal(movedDone(), false, 'the tilt must wait for B');
+  assert.equal(
+    order.slice(before).includes('cancel'),
+    false,
+    'the tilt must not take navigation and cancel B',
+  );
+  searches[0].resolve({ label: 'Place B', navigationMode: 'city-overview' });
+  assert.equal((await flyB).ok, true);
+  searches[0].options.onComplete();
+  const result = await moved;
+  assert.equal(result.ok, true);
+  assert.equal(result.motion, 'tilt');
+});
+
+// A later fly-to that finds nothing moves nothing: the motion still runs where
+// the earlier flight lands, whether the lookup fails before or after that.
+for (const order of ['lands first', 'not found first']) {
+  test(`a motion runs at its flight when a later fly-to finds nothing (${order})`, async (t) => {
+    t.after(() => interruptCameraMotion('test-cleanup'));
+    const harness = tiltAfterFlightHarness();
+    const { viewer, styleManager, flights } = harness;
+    const searches = [];
+    const runner = createGevActionRunner({
+      viewer,
+      styleManager,
+      dataManager: { layers: new Map(), getAll: () => [] },
+      searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+        searches.push({ query, options, resolve });
+      }),
+    });
+    assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+    const moved = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+    const flyB = runner('fly_to_location', { query: 'Nowhere' });
+    await new Promise((resolve) => setTimeout(resolve, 0));
+    if (order === 'lands first') flights[0].complete();
+    searches[0].resolve(null);
+    assert.equal((await flyB).ok, false);
+    if (order !== 'lands first') flights[0].complete();
+    const result = await moved;
+    assert.equal(result.ok, true, result.error);
+    assert.equal(result.motion, 'tilt');
+  });
+}
+
+test('a motion beside a fly-to that finds nothing never acts at an earlier reply\'s flight', async () => {
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const searches = [];
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+      searches.push({ query, options, resolve });
+    }),
+  });
+  // Reply 1: "fly to Austin", still flying.
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  // Reply 2: "fly to Nowhere and tilt".
+  const flyB = runner('fly_to_location', { query: 'Nowhere' });
+  const moved = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  searches[0].resolve(null);
+  assert.equal((await flyB).ok, false);
+  flights[0].complete();
+  const result = await moved;
+  assert.equal(result.ok, false);
+  assert.match(result.error, /did not arrive/);
+});
+
+// Two later lookups that both find nothing, in either order, leave the motion
+// acting where the first flight landed.
+for (const first of [0, 1]) {
+  test(`a motion looks past two lookups that found nothing (lookup ${first + 1} fails first)`, async (t) => {
+    t.after(() => interruptCameraMotion('test-cleanup'));
+    const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+    const searches = [];
+    const runner = createGevActionRunner({
+      viewer,
+      styleManager,
+      dataManager: { layers: new Map(), getAll: () => [] },
+      searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+        searches.push({ query, options, resolve });
+      }),
+    });
+    assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+    const moved = runner('move_camera', { motion: 'orbit' });
+    const flyB = runner('fly_to_location', { query: 'Nowhere B' });
+    const flyC = runner('fly_to_location', { query: 'Nowhere C' });
+    await new Promise((resolve) => setTimeout(resolve, 0));
+    searches[first].resolve(null);
+    searches[1 - first].resolve(null);
+    assert.equal((await flyB).ok, false);
+    assert.equal((await flyC).ok, false);
+    flights[0].complete();
+    const result = await moved;
+    assert.equal(result.ok, true, result.error);
+  });
+}
+
+test('a lookup cancelled by a newer one that finds nothing does not hide the flight that landed', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const searches = [];
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+      searches.push({ query, options, resolve });
+    }),
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  const flyB = runner('fly_to_location', { query: 'Place B' });
+  const flyC = runner('fly_to_location', { query: 'Nowhere C' });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  flights[0].complete();
+  // C's start takes navigation from B's lookup; C then finds nothing.
+  searches[0].resolve({ cancelled: true });
+  searches[1].resolve(null);
+  assert.equal((await flyB).cancelled, true);
+  assert.equal((await flyC).ok, false);
+  const result = await moved;
+  assert.equal(result.ok, true, result.error);
+});
+
+test('a motion sent after a fly-to that found nothing still waits for the flight before it', async (t) => {
+  // Serial dispatch: "fly to Austin, fly to Nowhere, tilt", one call at a time.
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, order, flights } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: async () => null,
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  assert.equal((await runner('fly_to_location', { query: 'Nowhere' })).ok, false);
+  const before = order.length;
+  const moved = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  const movedDone = settledYet(moved);
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal(movedDone(), false, 'the tilt must wait for the Austin flight');
+  assert.equal(order.slice(before).includes('cancel'), false);
+  flights[0].complete();
+  assert.equal((await moved).ok, true);
+});
+
+test('two lookups that found nothing in a row still leave the motion waiting for the flight', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, order, flights } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: async () => null,
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  assert.equal((await runner('fly_to_location', { query: 'Nowhere' })).ok, false);
+  assert.equal((await runner('fly_to_location', { query: 'Nowhere 2' })).ok, false);
+  const before = order.length;
+  const moved = runner('move_camera', { motion: 'orbit' });
+  const movedDone = settledYet(moved);
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal(movedDone(), false, 'the orbit must wait for the Austin flight');
+  assert.equal(order.slice(before).includes('cancel'), false);
+  flights[0].complete();
+  assert.equal((await moved).ok, true);
+});
+
+// A flight that already settled is still what a later failed lookup replaced.
+test('a motion acts at a landed flight that a later failed lookup replaced', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const searches = [];
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+      searches.push({ query, options, resolve });
+    }),
+  });
+  const flyA = runner('fly_to_location', { query: 'Slow A' });
+  const moved = runner('move_camera', { motion: 'orbit' });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  flights[0].complete();
+  const flyC = runner('fly_to_location', { query: 'Nowhere C' });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  // B's start made A's lookup stale; C then finds nothing.
+  searches[0].resolve({ cancelled: true });
+  searches[1].resolve(null);
+  assert.equal((await flyA).cancelled, true);
+  assert.equal((await flyC).ok, false);
+  const result = await moved;
+  assert.equal(result.ok, true, result.error);
+});
+
+test('a motion refuses when the flight a later failed lookup replaced was cancelled', async () => {
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const searches = [];
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+      searches.push({ query, options, resolve });
+    }),
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'orbit' });
+  const flyA = runner('fly_to_location', { query: 'Slow A' });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  // The motion sees Austin land, then follows A's lookup.
+  flights[0].complete();
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  flights[1].cancel();
+  const flyC = runner('fly_to_location', { query: 'Nowhere C' });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  searches[0].resolve({ cancelled: true });
+  searches[1].resolve(null);
+  assert.equal((await flyA).cancelled, true);
+  assert.equal((await flyC).ok, false);
+  const result = await moved;
+  assert.equal(result.ok, false);
+  assert.match(result.error, /did not arrive/);
+});
+
+test('a stale motion does not follow a newer reply\'s fly-to', async () => {
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  let live = true;
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'orbit' }, { isCurrent: () => live });
+  // A newer reply takes over and flies elsewhere; this reply is stale.
+  live = false;
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  flights[0].cancel();
+  // The newer flight never lands here: following it would hold this answer.
+  const result = await Promise.race([
+    moved,
+    new Promise((resolve) => setTimeout(() => resolve('still waiting'), 50)),
+  ]);
+  assert.notEqual(result, 'still waiting');
+  assert.equal(result.ok, false);
+  assert.equal(result.cancelled, true);
+});
+
+test('a motion gives up on a flight that has not landed in 15 s', async (t) => {
+  const { viewer, styleManager } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  t.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+  const moved = runner('move_camera', { motion: 'orbit' });
+  const movedDone = settledYet(moved);
+  await Promise.resolve();
+  t.mock.timers.tick(14_999);
+  await Promise.resolve();
+  assert.equal(movedDone(), false);
+  t.mock.timers.tick(1);
+  const result = await moved;
+  assert.equal(result.ok, false);
+  assert.match(result.error, /did not arrive/);
+});
+
+test('a motion follows a newer fly-to that lands while its own lookup stalls', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    // Place A's lookup never answers.
+    searchNavigation: () => new Promise(() => {}),
+  });
+  t.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+  runner('fly_to_location', { query: 'Place A' });
+  const moved = runner('move_camera', { motion: 'orbit' });
+  const movedDone = settledYet(moved);
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  t.mock.timers.tick(2_000);
+  await Promise.resolve();
+  assert.equal(movedDone(), false, 'the orbit must wait for the newer flight to land');
+  flights[0].complete();
+  for (let i = 0; i < 5 && !movedDone(); i += 1) await Promise.resolve();
+  assert.equal(movedDone(), true, 'the orbit must not wait out A');
+  const result = await moved;
+  assert.equal(result.ok, true);
+  assert.equal(result.motion, 'orbit');
+});
+
+// "Fly to Paris and orbit it", then a location-panel search while the camera
+// flies: the search stamps a deferred navigation without stopping the flight.
+// Run where the flight landed, the orbit took navigation and the search's
+// reassert failed, so the search was silently dropped.
+// Gemini runs one reply's calls one after another: by the time "pan left"
+// runs, "fly to Xyzzyville" has already found nothing, so there is no flight
+// to wait on, and the pan moved the old view with ok: true.
+test('a motion run after its reply\'s fly-to found nothing is not run', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: async () => null,
+  });
+  const reply = { turn: 1 };
+  const fly = await runner('fly_to_location', { query: 'Xyzzyville' }, { reply });
+  assert.equal(fly.ok, false);
+  const pan = await runner(
+    'move_camera',
+    { motion: 'pan', direction: 'left' },
+    { reply },
+  );
+  assert.equal(pan.ok, false);
+  assert.match(pan.error, /Not run: the fly-to in this reply found nothing/);
+  assert.equal(getActiveCameraMotion(), null);
+  // The same holds for OpenAI's reply identity.
+  const group = 'response-1';
+  await runner('fly_to_location', { query: 'Xyzzyville' }, { authorityGroup: group });
+  const tilt = await runner(
+    'move_camera',
+    { motion: 'tilt', pitchDeg: -45 },
+    { authorityGroup: group },
+  );
+  assert.equal(tilt.ok, false);
+  assert.match(tilt.error, /found nothing/);
+});
+
+test('a motion in a later reply runs after a fly-to that found nothing', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: async () => null,
+  });
+  await runner('fly_to_location', { query: 'Xyzzyville' }, { reply: { turn: 1 } });
+  const pan = await runner(
+    'move_camera',
+    { motion: 'pan', direction: 'left' },
+    { reply: { turn: 2 } },
+  );
+  assert.equal(pan.ok, true, pan.error);
+});
+
+test('a motion runs at a flight of its reply that landed after another lookup found nothing', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, flights } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: async () => null,
+  });
+  const reply = { turn: 1 };
+  await runner('fly_to_location', { query: 'Xyzzyville' }, { reply });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' }, { reply })).ok, true);
+  flights[0].complete();
+  const pan = await runner(
+    'move_camera',
+    { motion: 'pan', direction: 'left' },
+    { reply },
+  );
+  assert.equal(pan.ok, true, pan.error);
+});
+
+test('a motion queued behind a fly-to yields to a search started during the flight', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, flights, panelSearch, currentGeneration } =
+    tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'orbit' });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  const search = panelSearch();
+  flights[0].complete();
+  const result = await moved;
+  assert.equal(result.ok, false);
+  assert.match(result.error, /Not run: another navigation took the camera/);
+  assert.equal(getActiveCameraMotion(), null);
+  assert.equal(currentGeneration(), search, 'the search still owns navigation');
+});
+
+test('a motion behind a geocoded fly-to yields to a search started while it flies', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, panelSearch } = tiltAfterFlightHarness();
+  const searches = [];
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+    searchNavigation: (_viewer, query, options) => new Promise((resolve) => {
+      searches.push({ query, options, resolve });
+    }),
+  });
+  const fly = runner('fly_to_location', { query: 'Place A' });
+  const moved = runner('move_camera', { motion: 'orbit' });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  searches[0].resolve({ label: 'Place A', navigationMode: 'city-overview' });
+  assert.equal((await fly).ok, true);
+  panelSearch();
+  searches[0].options.onComplete();
+  const result = await moved;
+  assert.equal(result.ok, false);
+  assert.match(result.error, /another navigation took the camera/);
+  assert.equal(getActiveCameraMotion(), null);
+});
+
+test('a search before the fly-to does not drop the motion queued behind it', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager, flights, panelSearch } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  panelSearch();
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'tilt', pitchDeg: -45 });
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  flights[0].complete();
+  const result = await moved;
+  assert.equal(result.ok, true);
+  assert.equal(result.motion, 'tilt');
+});
+
+test('a fly-to that stops a running motion says so', async (t) => {
+  t.after(() => interruptCameraMotion('test-cleanup'));
+  const { viewer, styleManager } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  // The model sent the orbit first, so it ran at once.
+  const orbit = await runner('move_camera', { motion: 'orbit', mode: 'continuous' });
+  assert.equal(orbit.ok, true);
+  const fly = await runner('fly_to_location', { locationId: 'austin' });
+  assert.equal(fly.ok, true);
+  assert.equal(fly.stoppedMotion, 'orbit');
+  const again = await runner('fly_to_location', { locationId: 'austin' });
+  assert.equal('stoppedMotion' in again, false);
+});
+
+test('bad move_camera arguments are refused without waiting for a flight', async () => {
+  const { viewer, styleManager } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  assert.equal((await runner('fly_to_location', { locationId: 'austin' })).ok, true);
+  const moved = runner('move_camera', { motion: 'pan' });
+  const movedDone = settledYet(moved);
+  await new Promise((resolve) => setTimeout(resolve, 0));
+  assert.equal(movedDone(), true, 'the refusal must not wait on the flight');
+  const result = await moved;
+  assert.equal(result.ok, false);
+  assert.match(result.error, /needs a direction/);
+});
+
+test('stop does not wait for a voice flight', async () => {
+  const { viewer, styleManager } = tiltAfterFlightHarness();
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager,
+    dataManager: { layers: new Map(), getAll: () => [] },
+  });
+  await runner('fly_to_location', { locationId: 'austin' });
+  const result = await runner('move_camera', { motion: 'stop' });
+  assert.equal(result.ok, true);
+  assert.equal(result.motion, 'stop');
+});
+
 test('nearest-aircraft voice action serializes layer enable, arrival, refresh, airborne query, and selection', async () => {
   globalThis.window = globalThis.window || {
     clearTimeout,

src/voice/pointAndAsk.test.mjs

@@ -309,7 +309,10 @@ test('markup: the chip sits under the user caption with a screen-reader separato
   assert.equal(pointer.hidden, true);
   const separator = pointer.querySelector('.gev-voice-card-sr');
   assert.equal(separator.textContent, ': ');
-  assert.equal(separator.previousElementSibling.id, 'gev-voice-card-pointer-kind');
+  assert.equal(
+    separator.previousElementSibling.id,
+    'gev-voice-card-pointer-kind',
+  );
 });
 
 test('deixis prompt lint: one short rule, and every sentinel it names exists in the schema', () => {
@@ -347,15 +350,18 @@ test('deixis prompt lint: one short rule, and every sentinel it names exists in
   // the analyst area scopes) raised the ceiling to 55,500; tightening the
   // AREAS rule and the area tool descriptions left it at 55,103 as measured
   // below (every tool, osm_query included); main's Sea Marks and Ski Pistes
-  // layers bring it to 55,210, ~290 under. A new tool or rule has to fit
-  // under this ceiling.
+  // layers bring it to 55,210, and the tilt pitchDeg argument (with its -45
+  // default) and main's cockpit entry rule to 55,339. integrationContract's
+  // Overpass prompt is the tightest, at 55,499 (1 under). A new tool or rule
+  // has to fit under this ceiling.
   const size = instructions.length + JSON.stringify(GEV_REALTIME_TOOLS).length;
   assert.ok(size <= 55_500, `prompt size ${size}`);
 });
 
-
 test('after-tool speech allows returned items to answer requested lists and rankings', () => {
-  const rule = realtimeInstructions().split('\n').find(line => line.startsWith('AFTER TOOLS:'));
+  const rule = realtimeInstructions()
+    .split('\n')
+    .find((line) => line.startsWith('AFTER TOOLS:'));
   assert.match(rule, /requested analyst list or ranking/);
   assert.match(rule, /returned items.*returned values/);
   assert.match(rule, /keep their order/);