Vessel position, lock transits and channel closures — pairs naturally with water and marine.
Sources are sparse, awkward, or of a different provenance shape.
Position and motion as broadcast by the vessel itself.
Recorded queue and transit at the lock.
That a notice was in force for a reach at a time.
An instrument read a value at a place and a time.
Someone recorded that a thing happened. An observation, not a reading.
Measured at a fixed station. The record discloses which one and how far it is from you.
Covers an area, not a point. There is no nearest station, and we will not invent one.
Reported by the party being observed. That is a weaker claim and the record says so on its face.
Published by an authoritative operator of the instrument.
An authoritative body's analytical product. Its uncertainty is the source's own.
AIS is broadcast by the vessel, which in a casualty is frequently the party with an interest in where it was. Sealing it proves what was broadcast and when — never that the broadcast was true. That distinction is the whole value and it has to be on the face of the record.
Not named here yet. Candidate sources for this lane exist and are identified internally, but they have not been verified against the primary documentation — and an unverified source attribution on a public page is the exact mistake this company exists to avoid. They appear here when they have been checked, not before.
A grounding exhibit wants conditions and position together, which is what makes this lane attractive. The self-reporting problem is what keeps it in exploring.
Where a vessel actually was at the time of an incident. Demurrage and delay claims. Whether a closure notice was in effect.
That framing is our analysis of where disputes arise, not a claim of fact about any matter.
We are not capturing this lane today, so there is nothing here to sell you and we are not going to pretend otherwise. What we do want is to know what you would actually ask it. Requests decide what gets built next — that is not a courtesy, it is how the order is set.