Boating Coach US
Aids to navigationQuestion 261 of 352

What does a quick flashing light, about 60 flashes a minute, tell you?

  1. The channel is wide and safe
  2. The mark is a mooring buoy
  3. Use extra caution, such as at a sharp turn
  4. The area is closed to vessels
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Correct answer: Use extra caution, such as at a sharp turn

Quick flashing gives a warning at turns, narrow places, wrecks or obstructions.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.45 Light characteristics

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Questions last reviewed: 18 October 2026