KCG S 51 · MMSI 440184590

KCG S 51 is currently under way in the Sea of Japan, within the Japan / Korea shipping lane. It is sailing from ULSAN to ULSAN with an ETA of 14 Oct 2026, 03:18 UTC. Its exact coordinates, speed and ETA are shown at the top of this page and refresh from the latest AIS broadcast.

KCG S 51 broadcasts MMSI 440184590, with call sign 500HAEG. 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.

KCG S 51 is a maritime vessel registered under the KR flag. The vessel-type classification is derived from the AIS Type field broadcast by the ship's transponder and full KR flag list at /flag/kr.

MarineRadar shows the latest AIS broadcast from KCG S 51 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.