Carbon monoxide poisoning can cause brain damage or even death.
The symptoms include nausea, headache, dizziness, ringing in the ears and loss of consciousness.
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Keep all areas well ventilated.
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Do not block exhaust outlets.
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Do not idle the engines when people are in the water or while mooring.
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If the boat is equipped with a CO alarm, exit all closed spaces immediately when it sounds.
If you suspect carbon monoxide poisoning:
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Have the victim breathe fresh air deeply.
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If breathing stops, resuscitate.
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A victim often revives, then relapses because organs are damaged by lack of oxygen. Seek immediate medical attention.