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 >JP HHR OFF Oct 17, 2017 03:48 UTC
YUSEI MARU 9675432 431004377 >JP KSM C-S Oct 07, 2017 18:04 UTC
YUSEI MARU NO.2 9742106 431006557 >JP KND Oct 04, 2017 07:34 UTC

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