Which action is critical for maintaining safety regarding engine hazards?

Regular cleaning and maintenance of the engine is critical for maintaining safety regarding engine hazards because this proactive approach directly affects the operational reliability and safety of the boat. Engines are complex systems that can develop issues over time due to dirt, debris, fuel buildup, or wear and tear. When engine components are not regularly inspected and cleaned, there is an increased risk of malfunctions that can lead to dangerous situations, such as overheating, loss of power, or even fire. By ensuring the engine is clean and well-maintained, operators can significantly reduce the risk of accidents related to engine failure.

Supervising navigation, emergency drills, and weather monitoring are also important for overall safety, but they primarily address different aspects of boat operation. Navigation focuses on the safe movement of the vessel, emergency drills prepare the crew for handling emergencies, and weather monitoring informs decisions based on environmental conditions. However, these actions do not specifically mitigate the risks associated with engine hazards, which makes regular cleaning and maintenance the key action in this context.