Tank vessel means a ship that is constructed or adapted to carry, or that carries, oil in bulk as cargo or cargo residue, and that:
U.S.-flag vessel means a vessel of the United States or belonging to the United States, including any vessel registered or having national status under the laws of the United States.
Vessel means every description of watercraft, other than a seaplane on the water, used or capable of being used as a means of transportation on water.
Cargo vessel means a self-propelled ship in commerce, other than a tank vessel or a passenger vessel, three hundred or more gross tons, including but not limited to, commercial fish processing vessels and freighters.
Passenger vessel means any boat, ship, vessel, barge, or other floating craft of any kind carrying passengers for compensation.