Boating Coach US
Navigation lights and shapesQuestion 63 of 352

Which vessels may show a flashing blue light under the pilot rules?

  1. Any vessel in distress
  2. Law enforcement vessels on law enforcement or public safety duty
  3. Any vessel that is towing
  4. Commercial fishing vessels at night
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Correct answer: Law enforcement vessels on law enforcement or public safety duty

Only law enforcement vessels of the U.S. and the states may show the blue light.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 88: Annex V: Pilot Rules, § 88.05 Law enforcement vessels

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Questions last reviewed: 18 October 2026