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Navigation lights and shapesQuestion 102 of 352

Which lights show that a vessel is not under command?

  1. Two all-round white lights
  2. Red over white over red lights
  3. Two all-round red lights in a vertical line
  4. Two all-round green lights
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Correct answer: Two all-round red lights in a vertical line

A disabled vessel shows two red lights, one above the other.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.27 Vessels not under command or restricted in their ability to maneuver (Rule 27)

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Questions last reviewed: 18 October 2026