GLADSTONE · MMSI 503136870

GLADSTONE has not broadcast an AIS position for 25 days. The most recent broadcast placed it in the Coral Sea, on 13 Oct 2026, 02:31 UTC. It was sailing from SOUTHPORT QLD to BRISBANE. Vessels stop appearing on terrestrial AIS when they move beyond receiver range, so a gap does not necessarily mean the vessel is inactive.

GLADSTONE broadcasts MMSI 503136870. 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.

GLADSTONE is a maritime vessel registered under the AU flag. The vessel-type classification is derived from the AIS Type field broadcast by the ship's transponder and full AU flag list at /flag/au.

MarineRadar shows the latest AIS broadcast from GLADSTONE 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.

The vessel's design class is inferred from its dimensions, gross tonnage and dead weight, all of which are listed in the Identity and Specifications panels on the vessel page.