A new boat driving system is developed by loading an FCV or an EV onto an electric-propulsion boat. The electric-propulsion boat can be driven by means of batteries. This new method resulted in dramatically increasing the amount of loaded electric energy; with prior and existing batteries the amount of electric energy had been inadequate. It has made it possible, for instance, to produce excellent new performance and convenience in cruising distance and sail-speed. A boat is built for substantial experiments during this research. The research was conducted with the prototype boat in order to accomplish such goals as the reduction of CO2 emission and oil consumption. A Toyota “Mirai” fuel cell commercial vehicle, FCV, on board the hybrid boat is used to prove the usefulness of an FC system and a hydrogen tank as an electric generator. It is expected that the effective spread of a hydrogen system for marine transportation in the early 21st century might be provided by such a simplified way of an FCV as a hydrogen generator. We are hoping to provide the shipping circle with a new means of navigation for vessels in this century and to contribute to the country’s prosperity.