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Navigation lights and shapesQuestion 77 of 352

A boat is shorter than 20 meters. How may it carry its two sidelights?

  1. Combined in one lantern on the centerline
  2. Both on the port side
  3. As one white lantern
  4. They must be 3 meters apart
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Correct answer: Combined in one lantern on the centerline

On boats under 20 meters, the red and green lights may share one lantern on the centerline.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.21 Definitions (Rule 21)

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Questions last reviewed: 18 October 2026