About the Study Guide

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

Learn More Register for the Course

Vessel operators may not hear sound signals or voices if the engine is not adequately muffled.

  • A vessel’s engine must have a factory-installed muffler or exhaust water manifold for noise reduction or another effective muffling system.
    • Vessels built after January 1, 1993, must not exceed a noise level of 88 dBA.
    • Vessels built before January 1, 1993, must not exceed a noise level of 90 dBA.
  • If water is used for muffling, it must be in conjunction with a marine-designed exhaust manifold. Simply injecting water into an exhaust header does not satisfy the requirements for a muffling system.
  • The use of cutouts or exhaust stacks is prohibited.
  • Outboard motors, because of their exhaust design, do not require a muffling system.