KOSHIN MARU NO.21 — Tanker · IMO 9372779

KOSHIN MARU NO.21 has not broadcast an AIS position for 13 days. The most recent broadcast placed it in the Sea of Japan, on 26 Oct 2026, 02:52 UTC. It was sailing from NIIHAMA to HAKATASHIMA. Vessels stop appearing on terrestrial AIS when they move beyond receiver range, so a gap does not necessarily mean the vessel is inactive.

KOSHIN MARU NO.21 broadcasts MMSI 431501835 and is registered as IMO 9372779, with call sign JD2168. 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.

KOSHIN MARU NO.21 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 KOSHIN MARU NO.21 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.

KOSHIN MARU NO.21 is classed by NIPPON KAIJI KYOKAI (NKK), the classification society responsible for inspecting the vessel against safety, structural and operational rules. As a tanker, KOSHIN MARU NO.21 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. KOSHIN MARU NO.21 has a gross tonnage of 749 GT.