In general if you are in a powerboat and an engine fire starts when you are underway in motion what is the FIRST action that you should take?

If an engine fire starts on a powerboat while underway, the first action you should take is to immediately shut down the engine to stop fuel flow and reduce the fire's intensity. Next, activate the fire suppression system if available, and alert all passengers to prepare for evacuation. If the fire persists or grows, prepare to abandon the vessel and use life jackets while moving to a safe location away from the boat.