COAST GUARD 4 — SAR · MMSI 503144600

COAST GUARD 4 was last reported in the South Pacific Ocean, on 5 Nov 2026, 23:12 UTC. It was sailing from MELBOURNE to MELBOURNE with an ETA of 22 Jun 2026, 05:04 UTC. Its exact coordinates, speed and ETA are shown at the top of this page and refresh from the latest AIS broadcast.

COAST GUARD 4 broadcasts MMSI 503144600. 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.

COAST GUARD 4 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 COAST GUARD 4 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, COAST GUARD 4 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.