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When must navigation lights be displayed on a vessel?

  1. Only when the vessel is anchored

  2. From sunset to sunrise and when visibility is restricted

  3. During daylight hours

  4. At all times while the vessel is in motion

The correct answer is: From sunset to sunrise and when visibility is restricted

Navigation lights must be displayed on a vessel from sunset to sunrise and when visibility is restricted, as this is required by international marine regulations to ensure the safety of all vessels on the water. Option A is incorrect because navigation lights are not only necessary when a vessel is anchored, but also when it is in motion. Option C is incorrect because navigation lights are required during both daytime and nighttime hours. Option D is incorrect because navigation lights are not necessary when a vessel is not in motion, such as when it is moored.