The requested vessel with name KOSHIN MARU and MMSI:0 and IMO:7373004 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 AOM OFF Dec 11, 2017 15:40 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.