There's no two ways about it, carbon monoxide (CO) is dangerous. Most boaters know about the dangers of CO inside the cabin and are vigilant about maintaining CO detectors. Most are also aware that CO can build-up on deck. However, they are less informed about how the colorless and odorless gas can accumulate around their boat. For those who enjoy swimming or socializing in the water behind the boat or sitting on the swim platform, it can be a deadly ignorance.

Carbon monoxide builds up around engine and generator exhaust pipes in levels high enough to be lethal. Children and the elderly are particularly susceptible. To be safe, there are a number of precautions you can take.

On calm days, when CO concentrations can reach their highest levels, wait at least 15 minutes after the motor or generator has been shut off before venturing onto the swim platform or under the back deck.

Never operate an engine when someone is swimming or wading in the water immediately behind your boat, near the exhaust, or sitting on the swim platform or back deck. By the same token, this means no teak surfing–ever.

Never go underneath the swim platform where the exhaust is vented unless motors are off and the area has been properly ventilated. This area, sometimes referred to as a "death chamber," can become just that with only a breath or two.

Maintain a distance of at least 20 feet from any boat that is running a generator or engine.

You, as the captain, are responsible for protecting yourself, your passengers, and those around you from CO poisoning from your boat. It's a responsibility to be taken seriously.

– Linda Hoff