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What must any anchored vessel less than 50m in length display from sunset to sunrise?

  1. Sidelights

  2. Sternlight

  3. All-round white light

  4. Masthead light

The correct answer is: All-round white light

Any anchored vessel less than 50m in length must display an all-round white light from sunset to sunrise. This light should be mounted at a minimum height of 2.5m above the hull and should be visible from all directions. Sidelights, sternlight, and masthead light are incorrect because they are used for different purposes. Sidelights are used when underway, sternlight is used when moving in reverse, and masthead light is used when a vessel is under power. Therefore, for an anchored vessel, an all-round white light is the appropriate choice to display.