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Navigation lights and shapesQuestion 83 of 352

Which lights must a power-driven boat of 12 to under 50 meters show when underway at night?

  1. A masthead light, sidelights and a sternlight
  2. Only an all-round white light
  3. Only sidelights
  4. A red light over a white light
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Correct answer: A masthead light, sidelights and a sternlight

Boats under 50 meters need one masthead light, sidelights and a sternlight. The second masthead light is optional.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.23 Power-driven vessels underway (Rule 23)

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Questions last reviewed: 18 October 2026