Derived maritime event stream

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Derived maritime event stream: automatically detected vessel port arrival and departure events worldwide, produced by intersecting AIS position data with defined port boundary geofences at a one-minute detection cadence. Each event carries timestamp, vessel identity (MMSI/IMO) and a UN/LOCODE port identifier. Sibling endpoints add vessel port-call history, last-port-event status (in-port versus at-sea), inbound-vessel ETA lists per port, live AIS positions, and emissions estimates. The derived product — the geofence crossing event — is the asset; the raw AIS positions underneath are aggregated from public transmissions and third-party maritime providers.