I'm guessing from the AIS Vessel Tracking (mentioned in their data sources)- https://www.vesselfinder.com/realtime-ais-data https://www.vesselfinder.com/realtim

I'm guessing from the AIS Vessel Tracking (mentioned in their data sources)- https://www.vesselfinder.com/realtime-ais-data https://www.vesselfinder.com/realtime-ais-data