The requested vessel with name KOSHIN MARU and MMSI:0 and IMO:5194519 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
KOSHIN MARU NO.12 9058555 431300086 JP SYZ OFF Jan 23, 2018 14:24 UTC
KOSHIN MARU NO.17 N/A 431702510 May 20, 2017 14:54 UTC

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