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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.

Answer:

At all times and under all circumstances

Explanation:

  • 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. 

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