The requested vessel with name SEA LIFT 4 and MMSI:503002950 and IMO:0 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SEA LIFT 1 N/A 503011840 Feb 24, 2018 04:58 UTC
SEA LIFT 3 N/A 503023640 Jan 25, 2018 00:38 UTC
SEA LIFT 6 N/A 503053480 Feb 22, 2018 19:50 UTC

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