The requested vessel with name GAS TIGER and MMSI:0 and IMO:7603332 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
GAS TIGERS 9754824 374797000 PORT ELIZABETH Dec 24, 2017 07:19 UTC

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