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Navigation lights and shapesQuestion 95 of 352

Which lights must a sailing vessel show when underway at night?

  1. Sidelights and a sternlight
  2. A masthead light and a sternlight
  3. One all-round white light only
  4. Two masthead lights
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Correct answer: Sidelights and a sternlight

A sailboat under sail has no masthead light. It shows sidelights and a sternlight.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.25 Sailing vessels underway and vessels under oars (Rule 25)

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Questions last reviewed: 18 October 2026