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Navigation lights and shapesQuestion 100 of 352

A sailboat also runs its engine by day. What shape does it show forward?

  1. A ball
  2. A cone with the point down
  3. A cone with the point up
  4. A diamond
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Correct answer: A cone with the point down

A sailing vessel that is also using machinery shows a cone, apex downward.

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