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Navigation lights and shapesQuestion 65 of 352

What does an alternately flashing red and yellow light mean when a vessel shows it?

  1. It identifies a vessel doing a public safety activity
  2. It gives the vessel the right-of-way
  3. It means the vessel is aground
  4. It means the vessel is anchored
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Correct answer: It identifies a vessel doing a public safety activity

The light is only an identification signal and gives no special privilege.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 88: Annex V: Pilot Rules, § 88.07 Public safety activities

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Questions last reviewed: 18 October 2026