The requested vessel with name YUKI MARU and MMSI:0 and IMO:6816580 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
YUKI MARU NO.77 N/A 431659000 Feb 07, 2017 02:40 UTC

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