The requested vessel with name POLUX and MMSI:0 and IMO:6616320 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
POLUX N/A 225968720 Sep 24, 2017 18:04 UTC

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