Mercury 225 Manual page 43

Early symptoms of carbon monoxide poisoning, which are similar
to the symptoms of seasickness and intoxication, include
headache, dizziness, drowsiness, and nausea.
Inhaling engine exhaust gases can result in carbon monoxide
poisoning, which can lead to unconsciousness, brain damage,
or death. Avoid exposure to carbon monoxide.
Stay clear from exhaust areas when engine is running. Keep
the boat well‑ventilated while at rest or underway.
STAY CLEAR OF EXHAUST AREAS
Engine exhaust gases contain harmful carbon monoxide. Avoid
areas of concentrated engine exhaust gases. When engines are
running, keep swimmers away from the boat, and do not sit, lie,
or stand on swim platforms or boarding ladders. While underway,
do not allow passengers to be positioned immediately behind the
boat (platform dragging, teak/body surfing). This dangerous
practice not only places a person in an area of high engine
exhaust concentration, but also subjects them to the possibility of
injury from the boat propeller.
GOOD VENTILATION
Ventilate the passenger area, open side curtains or forward
hatches to remove fumes.
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GENERAL INFORMATION
!
WARNING
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