While different cruising grounds will have different rules on when to use a muffler on a powerboat, it is generally recommended that all vessels with an engine use a muffler to ensure the safety of everyone onboard and in the water. A muffler helps to reduce noise and ensure the driver or captain can hear any sound signals or calls from those around them. Mufflers are usually standard when buying a powerboat but it’s always a good idea to confirm this from the seller.