USS GOVT VESSEL 21 — Military Ops · MMSI 368926299

USS GOVT VESSEL 21 has not broadcast an AIS position for 30 days. The most recent broadcast placed it in the Caribbean Sea, on 7 Oct 2026, 14:51 UTC. It was sailing from AMADOR CRUISE PORT to PONCE. Vessels stop appearing on terrestrial AIS when they move beyond receiver range, so a gap does not necessarily mean the vessel is inactive.

USS GOVT VESSEL 21 broadcasts MMSI 368926299, with call sign NMSP. The MMSI is the radio identifier used by AIS; the IMO number stays with the ship for life and does not change with re-flagging or sale.

USS GOVT VESSEL 21 is classified as a military ops vessel registered under the US flag. The vessel-type classification is derived from the AIS Type field broadcast by the ship's transponder; full military ops fleet at /vessel-type/military-special and full US flag list at /flag/us.

MarineRadar shows the latest AIS broadcast from USS GOVT VESSEL 21 above, with current position, course, speed, and navigation status. Tap "View on map" to centre the live tracker on the vessel and watch its movement update in real time. The same data is available offline-friendly in the iOS and Android apps.

AIS transponders broadcast position every 2 seconds when underway at high speed and up to every 3 minutes at anchor. The position you see refreshes whenever the ship is in range of a coastal AIS receiver or a satellite pass — typically seconds in coastal waters and minutes offshore.

As a military ops, USS GOVT VESSEL 21 sits in the same design class as the other military opss listed in the Similar Vessels section of the vessel page, or in the full military ops directory at /vessel-type/military-special.