The requested vessel with name KORYU MARU and MMSI:0 and IMO:7851111 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
KORYU MARU 9697480 431005484 JP ANE OFF Feb 22, 2018 17:38 UTC
KORYU MARU 9644471 431003941 JP SUZ OFF Feb 22, 2018 05:52 UTC
KORYU MARU 9608104 431002489 >JP SGM Feb 22, 2018 04:12 UTC
KORYU MARU NO.28 N/A 431501445 Feb 21, 2018 20:43 UTC

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