From 812cdf6be71ba80d0b762a293951cbb5e782c373 Mon Sep 17 00:00:00 2001
From: Aditya <205600203+Rohilalala@users.noreply.github.com>
Date: Wed, 28 Oct 2026 15:09:27 +0530
Subject: [PATCH 1/2] =?UTF-8?q?fix(transit):=20show=20a=20reported=20359.6?=
 =?UTF-8?q?=C2=B0=20bearing=20as=20hdg=200=C2=B0,=20not=20hdg=20360=C2=B0?=
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The selected-vehicle card rounded the operator's reported bearing without
wrapping, so a GTFS-Realtime vehicle heading 359.5° or more read
"reported hdg 360°". The card now wraps after rounding: 359.6° reads
"reported hdg 0°", 359.4° still reads "reported hdg 359°".
---
 docs/CURRENT-STATE.md                  |  4 +++-
 src/layers/transit/policy.js           |  5 ++++-
 src/layers/transit/vocabulary.test.mjs | 12 ++++++++++++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/docs/CURRENT-STATE.md b/docs/CURRENT-STATE.md
index c55031a6a..4b9876428 100644
--- a/docs/CURRENT-STATE.md
+++ b/docs/CURRENT-STATE.md
@@ -4347,7 +4347,9 @@ to 0.45 at two minutes, 0.20 at ten minutes and 0.08 at fifteen minutes.
 display delay and newest-report age, reported speed/stop, vehicle ID, and
 available trail duration. Report age is rounded to whole seconds and stays in seconds while that rounded
 count is below 90; otherwise it shows completed minutes calculated from the
-rounded second count. Its anchor follows the rendered marker; text is
+rounded second count. The reported heading wraps after rounding to whole
+degrees, so a bearing of 359.5° or more reads `hdg 0°` rather than `hdg 360°`.
+Its anchor follows the rendered marker; text is
 checked at 4 Hz and published when it changes. DETECT labels retain route,
 mode and motion, with the selected label suppressed beside its fuller card.
 Candidate membership changes on revisions, coalesced at 4 Hz; paints read
diff --git a/src/layers/transit/policy.js b/src/layers/transit/policy.js
index 5dc17daeb..33e03aab4 100644
--- a/src/layers/transit/policy.js
+++ b/src/layers/transit/policy.js
@@ -405,9 +405,12 @@ export function buildTransitSelectionCopy(
     reportedMotion.push(
       t('reported {speed} km/h', { speed: Math.round(record.speedMps * 3.6) }),
     );
+  // 359.5° and above rounds to north; modulo keeps it from printing 360°.
   if (Number.isFinite(record.bearing))
     reportedMotion.push(
-      t('reported hdg {heading}°', { heading: Math.round(record.bearing) }),
+      t('reported hdg {heading}°', {
+        heading: Math.round(record.bearing) % 360,
+      }),
     );
   // The operator's own claim, kept as a REPORT rather than as the live state.
   // It describes the moment of the report, which the display may not have
diff --git a/src/layers/transit/vocabulary.test.mjs b/src/layers/transit/vocabulary.test.mjs
index d20910b74..89481efa3 100644
--- a/src/layers/transit/vocabulary.test.mjs
+++ b/src/layers/transit/vocabulary.test.mjs
@@ -43,6 +43,18 @@ test('the selection card calls a Toronto 501 a streetcar', () => {
   assert.doesNotMatch(copy.details.join(' | '), /Tram/);
 });
 
+test('the selection card reads a bearing that rounds to north as hdg 0°', () => {
+  const hdg = (bearing) =>
+    buildTransitSelectionCopy(
+      ttc(),
+      { id: '4400', routeId: '501', timestamp: 0, bearing },
+      'tram',
+      0,
+    ).details.find((line) => line.includes('hdg'));
+  assert.equal(hdg(359.4), 'reported hdg 359°');
+  assert.equal(hdg(359.6), 'reported hdg 0°');
+});
+
 test('detection labels carry the operator vocabulary within the field width', () => {
   const klass = transitDetectionClass('tram', ttc());
   assert.equal(klass, 'STREETCAR TTC');

From 197f24d8972b67ace59076748d37347c81559c13 Mon Sep 17 00:00:00 2001
From: Aditya <205600203+Rohilalala@users.noreply.github.com>
Date: Wed, 28 Oct 2026 17:38:45 +0530
Subject: [PATCH 2/2] docs(changelog): add #1452 fragment

---
 changelog.d/1452-transit-heading-north.md | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 changelog.d/1452-transit-heading-north.md

diff --git a/changelog.d/1452-transit-heading-north.md b/changelog.d/1452-transit-heading-north.md
new file mode 100644
index 000000000..95c81a080
--- /dev/null
+++ b/changelog.d/1452-transit-heading-north.md
@@ -0,0 +1,3 @@
+- Show a transit vehicle's reported bearing of 359.5° or more as 0°. The
+  selected-vehicle card rounded it without wrapping, so a bus heading 359.6°
+  read "reported hdg 360°" (Aditya, @Rohilalala, #1452).