The requested vessel with name YAMATO MARU and MMSI:0 and IMO:5394779 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
YAMATO MARU 9424742 431000080 >JP NGO N3 OFF Dec 12, 2017 23:41 UTC
YAMATO MARU N/A 431002818 KINUURA Jan 22, 2017 05:35 UTC

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