MARINE RESCUE BB21 — SAR · MMSI 503128640

MARINE RESCUE BB21 has not broadcast an AIS position for 6 days. The most recent broadcast placed it in the Tasman Sea, on 1 Nov 2026, 04:44 UTC. It was sailing from BAYVIEW to NEWPORT. Vessels stop appearing on terrestrial AIS when they move beyond receiver range, so a gap does not necessarily mean the vessel is inactive.

MARINE RESCUE BB21 broadcasts MMSI 503128640, with call sign BB21. 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.

MARINE RESCUE BB21 is classified as a sar vessel registered under the AU flag. The vessel-type classification is derived from the AIS Type field broadcast by the ship's transponder; full sar fleet at /vessel-type/tug-pilot-vessel and full AU flag list at /flag/au.

MarineRadar shows the latest AIS broadcast from MARINE RESCUE BB21 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 sar, MARINE RESCUE BB21 sits in the same design class as the other sars listed in the Similar Vessels section of the vessel page, or in the full sar directory at /vessel-type/tug-pilot-vessel.