The requested vessel with name TANCRED and MMSI:0 and IMO:5351947 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
TANCRED 9654127 503678700 Aug 22, 2017 08:23 UTC
TANCRED 8605167 258787000 CN JIAHP-_(D Mar 13, 2016 02:06 UTC

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