Mufflers and Noise Level Limits
Vessel operators may not hear sound signals or voices if the engine is not adequately muffled.
- All vessel engines must be equipped with an effective muffling device or underwater exhaust.
- The noise level of any motorized vessel must not exceed these limits.
- Stationary test limit:
- 90 decibels for engines manufactured prior to January 1, 1991
- 88 decibels for engines manufactured on or after January 1, 1991
- Moving test limit as measured on the A scale and from a distance of 50 feet:
- 84 decibels for engines manufactured prior to January 1, 1991
- 82 decibels for engines manufactured on or after January 1, 1991
- Stationary test limit:
- A vessel may be equipped with a switchable device that will reduce the exhaust noise level in compliance with the decibel limits.
