The requested vessel with name GLOBAL LEADER and MMSI:0 and IMO:7603576 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
GLOBAL LEADER 9237319 311475000 US PCV Dec 11, 2017 22:39 UTC

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