The requested vessel with name ARGENTINA STAR and MMSI:0 and IMO:7636688 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
ARGENTINA STAR 8814304 636012654 BHAVNAGAR Feb 22, 2013 01:45 UTC

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