Where Carbon Monoxide Can Accumulate

Inadequately ventilated canvas enclosures.
Exhaust gas trapped in enclosed places.
Blocked exhaust outlets.
Another vessel’s exhaust. CO from the boat docked next to you can be just as deadly.
“Station wagon effect” or back drafting.
At slow speeds, while idling, or stopped. Be aware that CO can remain in or around your boat at dangerous levels even if your engine or the other boat’s engine is no longer running!

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