Prevent Carbon Monoxide Exposure on a Boat
Where exhaust can collect, why swim platforms are dangerous with engines running, and what the Coast Guard recommends.
Map Every Exhaust Outlet
Identify engine, generator, heater, and other combustion exhaust outlets. The Coast Guard advises keeping people away from these areas and maintaining fresh-air circulation throughout the boat.
Exhaust can be drawn into enclosed or partly enclosed spaces depending on wind, speed, trim, and nearby structures. Never assume an open hatch guarantees safe ventilation.
Keep People Off The Stern With Engines Running
The Coast Guard says never to sit, hang on, or “teak surf” from the back deck or swim platform while engines are running. Do not swim beneath platforms near exhaust outlets unless the area has been properly ventilated and the engines are secured as appropriate.
Brief passengers before departure, especially when the boat has a large platform or towing activity that makes the stern attractive as a seating area.
Install And Maintain Alarms
Use marine carbon-monoxide alarms in the locations specified for the boat and follow their testing and replacement instructions. Never ignore an alarm or disable it to silence a recurring problem.
Maintain engines, generators, exhaust systems, and ventilation equipment. A damaged exhaust hose or blocked outlet requires correction, not an open window as a substitute repair.
Respond To Possible Exposure
The Coast Guard cautions that carbon-monoxide symptoms can resemble seasickness. Move the person to fresh air immediately and seek medical attention unless you are sure the symptoms are not carbon-monoxide exposure.
Shut down sources only when that can be done safely, ventilate, and contact emergency services. Do not re-enter a suspect space or resume operation until the cause has been identified and corrected.