The present invention is a motorcycle theft prevention system that comprises a tilt switch and a control circuit. After the user installed the present invention, the control circuit stays in the deactivated state until the motorcycle is oriented to a different angle. When the motorcycle is oriented to a different angle, the control circuit activates the horn and light source to warn the user of possible theft.

The present invention is a motorcycle theft prevention system that comprises a tilt switch and a control circuit. After the user installed the present invention, the control circuit stays in the deactivated state until the motorcycle is oriented to a different angle. When the motorcycle is oriented to a different angle, the control circuit activates the horn and light source to warn the user of possible theft.

An exemplary fuel cell ship is a fuel cell ship for propelling a hull by using electric power supplied by a fuel cell that generates electric power through an electrochemical reaction of fuel, and includes at least one compartment including an emission source of the fuel, and a vent pipe through which the fuel in the compartment is released to outside of the hull. A release port of the vent pipe is located at a position higher than a cabin or a bridge provided on the hull.

An exemplary fuel cell ship is a fuel cell ship for propelling a hull by using electric power supplied by a fuel cell that generates electric power through an electrochemical reaction of fuel, and includes at least one compartment including an emission source of the fuel, and a vent pipe through which the fuel in the compartment is released to outside of the hull. A release port of the vent pipe is located at a position higher than a cabin or a bridge provided on the hull.