CHANG DA 21 — Tug · IMO 9631292

CHANG DA 21 was last reported at anchor in the East China Sea, within the Taiwan Strait, on 8 Nov 2026, 18:35 UTC. It was sailing from PINGTAN to PINGTAN with an ETA of 25 Oct 2026, 08:45 UTC. Its exact coordinates, speed and ETA are shown at the top of this page and refresh from the latest AIS broadcast.

CHANG DA 21 broadcasts MMSI 412475970 and is registered as IMO 9631292, with call sign BSAI . 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.

CHANG DA 21 is classified as a tug vessel registered under the CN flag. The vessel-type classification is derived from the AIS Type field broadcast by the ship's transponder; full tug fleet at /vessel-type/tug-pilot-vessel and full CN flag list at /flag/cn.

MarineRadar shows the latest AIS broadcast from CHANG DA 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.

CHANG DA 21 is classed by CHINA CLASSIFICATION SOCIETY, the classification society responsible for inspecting the vessel against safety, structural and operational rules. As a tug, CHANG DA 21 sits in the same design class as the other tugs listed in the Similar Vessels section of the vessel page, or in the full tug directory at /vessel-type/tug-pilot-vessel. CHANG DA 21 has a gross tonnage of 971 GT.