The requested vessel with name SEIWA MARU and MMSI:0 and IMO:5318854 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SEIWA MARU 9336933 431200693 >JP SGM NAKANO3 Jan 21, 2018 11:43 UTC

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