High Quality Content by WIKIPEDIA articles! A personal water craft (PWC), also called water scooter, is a recreational watercraft that the rider rides or stands on, rather than inside of, as in a boat. They have an inboard engine driving a pump jet that has a screw-shaped impeller to create thrust for propulsion and steering. They are often referred by the trademarked brand names Jet Ski, WaveRunner, or Sea-Doo. Most are designed for two or three people, though four-passenger models exist. The United States Coast Guard defines a personal watercraft, amongst other criteria, as a jet drive boat less than 13` in length, in order to exclude from that definition more conventional sized jet boats. There is a wide variety of "jet boats" many of which exceed 30-40` in length.