What is the aim of using a fire extinguisher during a boat fire?

The aim of using a fire extinguisher during a boat fire is to aim at the base of the flames. This is crucial because the fire originates from the fuel source, and targeting the base helps to effectively extinguish the flames where they begin. By applying the extinguishing agent directly to the source of the fire, you can interrupt the combustion process and reduce the heat that is fueling the flames. This method is more effective than directing the extinguisher at the flames themselves, as effective suppression requires dealing with the root of the fire rather than only the visible flames.

For example, if you were to aim at the smoke or the sides of the boat, you would not be addressing the source of the fire and would likely be ineffective in putting it out. Aiming into the air above the flames could disperse the extinguishing agent where it is not needed and may not reach the necessary area to combat the fire effectively. Thus, directing the extinguisher at the base of the flames is the best practice when dealing with any type of fire, including those occurring on a boat.