Boating Coach US
Navigation lights and shapesQuestion 103 of 352

Which day shapes show that a vessel is not under command?

  1. Two diamonds
  2. Ball, diamond, ball
  3. Two cones
  4. Two balls in a vertical line
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Correct answer: Two balls in a vertical line

A vessel not under command shows two balls by day.

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