The requested vessel with name SAN MARCOS and MMSI:0 and IMO:5107669 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SAN MARCOS N/A 367549670 Jan 23, 2018 04:39 UTC
SAN MARCOS N/A 345900526 Feb 09, 2014 14:03 UTC

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