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You are looking at a preview of what’s in the timed Missouri Boat Ed Course. Feel free to look around, but you’ll need to register to begin progress toward getting your Missouri Boating Safety Certification Card.

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Excessive noise can prevent a vessel operator from hearing signals and voices. A motorboat’s engine must have a factory-installed muffler or exhaust water manifold for noise reduction or another effective muffling system.

  • Motorboats built on January 1, 1996, or later must not exceed a noise level of 90 dBA when stationary at idle and measured from a distance of 3 feet.
  • All motorboats must not exceed a noise level of 86 dBA when measured from a distance of 50 feet.
  • You may not remove or modify a muffler or muffling system if the result is increased noise level.
  • If the exhaust system uses water for muffling, it must comply with the noise level restrictions.