The requested vessel with name HEIMAEY and MMSI:0 and IMO:6712071 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
HEIMAEY 9532707 251227000 WESTMANISLANDS Dec 12, 2017 13:49 UTC

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