The requested vessel with name YUSEI MARU and MMSI:0 and IMO:6819910 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
YUSEI MARU 9675432 431004377 >JP SKT Dec 14, 2017 07:00 UTC
YUSEI MARU 9780419 431006969 Dec 13, 2017 20:29 UTC
YUSEI MARU NO.2 9742106 431006557 >JP SMN / MN Dec 14, 2017 10:57 UTC

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