Free AIS vessel tracker with ship search by name, IMO or MMSI, plus vessel particulars, photos and recent port calls. A good alternative to MarineTraffic.
tools / marinetraffic
MarineTraffic
The best-known AIS ship-tracking platform. Live vessel positions, port calls, vessel particulars and photos. Historical tracks require a paid plan.
field note
AIS can be switched off or spoofed. A gap in a vessel's track near a sanctioned port or ship-to-ship transfer area is itself a finding. Combine it with satellite imagery to check.
used in playbooks
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