Operator competency and the lawQuestion 299 of 566

Within what distance from shore must a boat with a motor use a muffler?

  1. 5 nautical miles (9.26 km)
  2. 1 nautical mile
  3. 2 nautical miles
  4. 10 nautical miles
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Correct answer: 5 nautical miles (9.26 km)

The muffler rule applies within 5 nautical miles of shore. Stock outboard engines are exempt.

Source: Safe Boating Guide (TP 511E, 2026), Reduce engine noise, page 39

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Questions last reviewed: 18 October 2026