Personal Watercrafts (PWC) aka Jet Ski

A personal water craft (PWC) is a recreational watercraft that the rider rides or stands on. Models 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 brand names Jet Ski, WaveRunner, or Sea-Doo. The Coast Guard defines a personal watercraft, amongst other criteria, as a jet drive boat less than 13' in length, in order to exclude more conventional sized jet boats. Most are designed for two or three people, though four-passenger models exist.