The requested vessel with name INVESTIGATOR II and MMSI:533110044 and IMO:0 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
INVESTIGATOR II 9766968 503000089 STANLEY Feb 20, 2018 02:25 UTC

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