A boat can be provided with an electrically controlled outboard motor, or other type of propulsion unit, for producing thrust according to an operation of a remote control unit provided in a hull of the boat. The remote control ECU which can output a remote control operation signal can be provided in the remote control unit. An engine ECU which can receive the remote control operation signal and control the outboard motor, can be provided in the outboard motor. The remote control unit and the outboard motor can have respective connectors directly connected to each other via a DBW CAN cable.