The requested vessel with name MENTAWAI and MMSI:0 and IMO:6413974 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
MENTAWAI N/A 338155537 Jun 08, 2013 11:57 UTC

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