Not a problem . The ferry is registered and crew by america's.
The Jones Act doesn't apply to US Flagged ships only Foreign flagged ships.
There a couple of excepts on the east coast where canadian flagged ferries run between the US and canada.
SS Ithaca , Volendam , Mariner of the Seas (x2) , Veendam , Coral Princess , Island Princess (x3) , Emerald Princess,Sapphire Sapphire (x3),Diamond Princess