Calculates sailed distance and average speed from a UTC date/time to the latest available point. It tries api/positions.php first, then position.json.
Data source
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Positions
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First record
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Latest record
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Loading track…
Examples: 2026-03-10 00:00 UTC or 2026-03-10 00:00:00 UTC. The calculation uses the plotted track geometry, not the stored legNm or cumNm, so it is robust if those fields contain inconsistencies.