KOYO MARU — Tanker · IMO 9853369

KOYO MARU was last reported moored in the Sea of Japan, within the Japan / Korea shipping lane, on 6 Nov 2026, 07:24 UTC. It was sailing from NIIHAMA to SAIJO with an ETA of 9 Nov 2026, 07:50 UTC. Its exact coordinates, speed and ETA are shown at the top of this page and refresh from the latest AIS broadcast.

KOYO MARU broadcasts MMSI 431011537 and is registered as IMO 9853369, with call sign JD4414. 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.

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

MarineRadar shows the latest AIS broadcast from KOYO MARU 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 tanker, KOYO MARU sits in the same design class as the other tankers listed in the Similar Vessels section of the vessel page, or in the full tanker directory at /vessel-type/tanker. KOYO MARU has a gross tonnage of 199 GT.