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SESK: Stuff Everyone Should Know · sesk.info/boat-naval-vessel-500-yards-slow

Within what distance of a large U.S. naval vessel must you slow to minimum speed?

500 yards.

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  1. 100 yards
  2. 1,000 yards
  3. 500 yards ✔

Why: The protection zone extends 500 yards around U.S. naval vessels over 100 feet. Inside it, use the minimum speed needed to keep a safe course, and stay at least 100 yards away unless authorized.

Huh, didn't know that: When conditions permit, officials should announce movements of large naval vessels on VHF channel 16.

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What's the speed limit near a Navy ship? Slow enough to wave politely.
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References

Answer: 500 yards. The protection zone extends 500 yards around U.S. naval vessels over 100 feet. Inside it, use the minimum speed needed to keep a safe course, and stay at least 100 yards away unless authorized.

  1. U.S. Coast Guard, A Boater's Guide to the Federal Requirements for Recreational Boats www.uscgboating.org/assets/1/AssetManager/Boaters-Guide-to-Federal-Requirements-for-Receational-Boats-20231108.pdf
    Do not approach within 100 yards, and slow to minimum speed within 500 yards, of any U.S. Naval vessel.
    Checked 2026-10-09.

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