The requested vessel with name POLESTAR and MMSI:0 and IMO:7421992 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
POLESTAR 9364813 371811000 ZHENJIANGDAGANG Oct 20, 2017 20:00 UTC
POLESTAR N/A 235109755 Oct 12, 2017 12:47 UTC
POLESTAR1 N/A 431009853 Oct 09, 2017 09:21 UTC

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