Clayton Jacobson II invented the Personal Watercraft (PWC), which utilized a jet pump instead of a propeller for propulsion. This made it safer and more maneuverable in shallow water. He licensed the design to Kawasaki, who released the 'Jet Ski' in 1973. This invention created a new category of marine recreation and is widely used today by lifeguards and coast guards for rapid response in surf zones, where traditional boats would struggle to operate.