Which piece of equipment on a boat helps prevent propeller strike injuries?

The engine cut-off switch lanyard is crucial for preventing propeller strike injuries. When a lanyard is properly attached to the operator and the engine cut-off switch, it ensures that if the operator falls overboard or is ejected from the boat, the engine will automatically shut off. This action significantly decreases the risk of the boat continuing to move in circles, which could lead to serious injuries from the propeller striking the person in the water.

In contrast, while a life jacket provides essential buoyancy and safety for floating in water, it does not prevent accidents related to the boat’s movement. An emergency whistle is used to signal for help in case of emergencies but does not affect the functioning of the boat itself. Navigation lights are important for visibility during low-light conditions, ensuring safe operation and avoiding collisions with other vessels, but they do not serve to prevent injuries related to the propeller. Therefore, the engine cut-off switch lanyard plays a specific role in enhancing safety against propeller strikes, making it the best choice in this context.