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 9780419 431006969 Feb 21, 2018 03:53 UTC
YUSEI MARU 9675432 431004377 >JP TMK S Feb 19, 2018 18:08 UTC
YUSEI MARU NO.2 9742106 431006557 >JP KOJ Feb 19, 2018 23:11 UTC

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