Boating Coach US
Aids to navigationQuestion 267 of 352

How do you start a sound signal that has radio activation?

  1. Call the Coast Guard on channel 9
  2. Key your VHF microphone five times on the charted channel
  3. Flash a light at the buoy three times
  4. Sound your horn five times
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Correct answer: Key your VHF microphone five times on the charted channel

The system turns on with five mic clicks. It runs about 45 minutes.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.47 Sound signals

All questionsPractice the topic "Aids to navigation"

Questions last reviewed: 18 October 2026