Vessel operators may not hear sound signals or voices if the engine is not adequately muffled.
- The exhaust of every internal combustion engine on any vessel must be effectively muffled by a muffler or underwater exhaust. That is, the engine’s exhaust must be muffled or suppressed at all times so as not to create excessive noise.
- The use of cutouts is prohibited.
- It is illegal to remove or modify the exhaust or muffler system of a vessel.
- Vessels involved in a marine event authorized by the Massachusetts Environmental Police are exempt from the requirements above.