Boating Coach US
Navigation lights and shapesQuestion 112 of 352

Besides the anchor light, which extra lights show on a vessel aground, if practicable?

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

A vessel aground adds two red lights, and by day three balls.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.30 Vessels anchored, aground and moored barges (Rule 30)

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Questions last reviewed: 18 October 2026