KAIRYU — Dredger · IMO 8663731

KAIRYU was last reported under way in the Sea of Japan, within the Japan / Korea shipping lane, on 6 Nov 2026, 04:15 UTC. It was sailing from TOKYO to TOKYO with an ETA of 6 Nov 2026, 03:46 UTC. Its exact coordinates, speed and ETA are shown at the top of this page and refresh from the latest AIS broadcast.

KAIRYU broadcasts MMSI 431002764 and is registered as IMO 8663731, with call sign JD3107. 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.

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

MarineRadar shows the latest AIS broadcast from KAIRYU 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 dredger, KAIRYU sits in the same design class as the other dredgers listed in the Similar Vessels section of the vessel page, or in the full dredger directory at /vessel-type/military-special.