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Navigation lights and shapesQuestion 64 of 352

Where must a law enforcement vessel place its flashing blue light?

  1. On the highest mast available
  2. Below the waterline
  3. So it does not hide its navigation lights
  4. Where it covers the sidelights
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Correct answer: So it does not hide its navigation lights

The blue light must not interfere with the visibility of the navigation lights.

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