The requested vessel with name MARUI MARU and MMSI:0 and IMO:6926816 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
MARUI MARU N/A 431000566 Feb 17, 2018 22:04 UTC

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