The requested vessel with name CHOKAI and MMSI:0 and IMO:7900792 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
CHOKAI N/A 431999629 Apr 12, 2017 00:43 UTC
CHOKAIMARU N/A 431002191 >JP SGM Feb 15, 2018 02:07 UTC
CHOKAISAN 9562685 431375000 SA RTA Feb 23, 2018 11:03 UTC

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