The requested vessel with name RIVER PRINCESS and MMSI:0 and IMO:7372177 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
RIVER PRINCESS N/A 269057423 WIEN Dec 11, 2017 04:34 UTC
RIVER PRINCESS N/A 235054919 LONDON Sep 23, 2017 20:14 UTC
RIVER PRINCESS N/A 244070801 DUSSELDORF Jan 17, 2015 06:55 UTC
RIVER PRINCESS 5113163 316005612 LOCAL TOW Dec 11, 2014 11:16 UTC

Also, you may try to find the vessel in our comprehensive Vessels Database or track this ship on the map.