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docs: record the AIS unavailable-code handling

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CONTRIBUTING asks for docs/CURRENT-STATE.md and CHANGELOG.md in the same PR
as a runtime behaviour change.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
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Theerayut BoonkirdandClaude Opus 5 committed 2026-09-18 00:41:06 +01:00
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docs/CURRENT-STATE.md
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# God's Eye View Current State
AIS encodes speed over ground in 0.1-knot units and course over ground in
0.1-degree units, reserving the top code of each field for "not available", so
those reports arrive as 102.3 knots and 360 degrees. Both are stored as unknown,
and vessel cards, the HUD and analyst queries show a missing measurement rather
than a reading. Heading keeps its existing separate check for its own sentinel.
Genuine readings are unchanged, including a stopped vessel's zero and the
highest speed and course the fields can encode.
Vessel snapshot completeness is separate from freshness. A current snapshot with
rejected or duplicate records shows PARTIAL with accepted/received counts; stale
or unknown freshness and transport failures retain their warnings. Partial