A jet ski is a personal powered water craft.

Some motorboats are fitted with inboard engines, others have an outboard motor installed on the rear, containing the internal combustion engine, the gearbox and the propeller in one portable unit. An inboard-outboard contains a hybrid of an inboard and an outboard, where the internal combustion engine is installed inside the boat, and the gearbox and propeller are outside.[from wikipedia]

Police boatused by police agencies to patrol bodies of water

Run by the Blue & Gold Fleet, the Rocket Boat provides high speed thrill rideson San Francisco Bay.

Tugboat maneuvers vessels by pushing or towing them