KOURYOUMARU — Fishing · MMSI 431014153

KOURYOUMARU has not broadcast an AIS position for 21 days. The most recent broadcast placed it in the East China Sea, on 18 Oct 2026, 04:27 UTC. It was sailing from ITOMAN to ITOMAN. Vessels stop appearing on terrestrial AIS when they move beyond receiver range, so a gap does not necessarily mean the vessel is inactive.

KOURYOUMARU broadcasts MMSI 431014153. 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.

KOURYOUMARU is classified as a fishing vessel registered under the JP flag. The vessel-type classification is derived from the AIS Type field broadcast by the ship's transponder; full fishing fleet at /vessel-type/fishing and full JP flag list at /flag/jp.

MarineRadar shows the latest AIS broadcast from KOURYOUMARU 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 fishing, KOURYOUMARU sits in the same design class as the other fishings listed in the Similar Vessels section of the vessel page, or in the full fishing directory at /vessel-type/fishing.