The requested vessel with name KOSY and MMSI:251493640 and IMO:0 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
KOSY N/A 205338910 Aug 25, 2017 14:19 UTC
KOSYO MARU 9839234 431010694 >JP YOK OFF Feb 19, 2018 07:48 UTC
KOSYU MARU NO,11 9820415 431010674 >JP YKK 3W Feb 19, 2018 07:49 UTC
KOSYU MARU NO.8 9562025 431001082 >JP SBK /E Feb 19, 2018 07:16 UTC

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