HERON

Patrol Vessel · IMO 4685729 · MMSI 366999664 · Last UTC 2026-03-04 18:03 UTC

Average Speed (60D)

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HERON

Patrol Vessel

Position time: 2026-03-04 18:03 UTC

Flag: usa

Country: United States of America

IMO: 4685729

MMSI: 366999664

GT: 200

Year: 2002

Call sign: NEPM

Destination is not available in AIS.

AIS refresh is typically every 4–6 hours, sometimes up to 1–2 days.

Track window: last 49 days

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Nearest known locations from geocache labels around the vessel.

Nearby locations are being calculated.

Modeled destinations using route history and peer traffic context.

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Inferred port calls from sparse AIS snapshots.

Port call inference is loading.

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How often is this page updated?

AIS updates are usually every 4–6 hours. In low-coverage areas delays up to 1–2 days are possible.

Why are some vessel fields missing?

Some AIS transponders do not transmit complete static metadata.

How accurate are destinations and port calls?

These are probabilistic model outputs and should be treated as signals, not confirmations.