Patent ID: RE40762

Claim:
A jet-propulsion watercraft, comprising: a water jet pump including an outlet port and a steering nozzle, said water jet pump pressurizing and accelerating sucked water and ejecting the water from the outlet port to propel the watercraft as a reaction of the ejecting water; a steering operation means operating in association with the steering nozzle of the water jet pump; a steering sensor comprised of a proximity sensor, for detecting a steering operation of the steering operation means; a steering means for steering the watercraft adapted to be subjected to a steering assist mode control, when a signal indicating that the steering position sensor has detected the steering operation is received; and a control device connected to the steering position sensor by a signal line, the control device giving a signal to the steering position sensor and detecting a signal in the signal line indicating that the steering operation means is or is not steered, wherein the signal in the signal line does not change when the steering operation means is not steered, and thereby the control device does not execute the steering assist mode control, and the signal in the signal line changes when the steering operation means is steered, and thereby the control device executes the steering assist mode control.