It is essential to maintain a proper outlook under all circumstances and at all times while using human sight and hearing while operating a boat.
It is essential to do so as it helps avoid the risk of collision with other boats and thus, maintain safety and also because it helps to make a full appraisal of the situation under which the boat is being operated.
The answer is : All boats at all hours. Maintaining a proper lookout using human sight and hearing applies to All boats at all hours, specially at extreme weather conditions. They should keep up the watch at all times.
