You can correctly store the fire
extinguisher in your boat if it’s in the required size. You don’t need a bulky one that may give you trouble.
According to the US Coast Guard, the correct quantity of fire extinguishers that you have to get is based on your boat’s size. Boats shorter than 26 feet don’t need a fire extinguisher at all. However, they won’t be released when used for the commercial purpose of carrying passengers and with the construction that can entrap flammable and explosive liquids or gases.