When must you maintain a proper lookout by sight and hearing on a boat?

Maintaining a proper lookout by sight and hearing on a boat is essential at all times to ensure the safety of the vessel and its occupants. This is particularly crucial in busy or confined waterways, during poor visibility conditions, and when navigating near other vessels or hazards. A proper lookout helps to detect potential dangers, such as other boats, obstacles, or changes in weather, enabling timely and safe decision-making. Failure to maintain a proper lookout can lead to collisions and other maritime accidents.