The requested vessel with name NORTHERN NAV and MMSI:0 and IMO:5344657 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
NORTHERN NAVIGATOR N/A 316002398 May 13, 2015 09:23 UTC

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