2.3. Carbon monoxide

There is a carbon monoxide monitor system in the boat. The system alarm is located in the main switch panel.

 For the exact location of the CO monitor, see the figure Safety diagram.

  • With regular intervals, check that the monitor system is functioning.

  • When the boat is in use, do not turn the system switch off.

Carbon monoxide (CO) is colorless, odorless, tasteless, and extremely dangerous gas.

All engines, generators, and fuel burning appliances produce CO as exhaust.

Prolonged exposure to low concentrations or very quick exposure to high concentrations will cause brain damage or death.

Open all doors, curtains, windows, and hatches to let fresh air circulate when running the engine or generator or burning any fuel while the boat is anchored, moored or docked.

Symptoms of carbon monoxide poisoning are dizziness, ears ringing, headache, nausea and unconsciousness. A poisoning victim’s skin often turns cherry red.

Because carbon monoxide gas (CO) is odorless, colorless and tasteless, it is unlikely to be noticed until a person is affected.

  • If CO poisoning is suspected, have the victim breath fresh air deeply.

  • If breathing stops, resuscitate.

  • A victim often revives, but then relapses because organs are damaged by the lack of oxygen.

    Seek immediate medical attention.

Dangerous concentrations of carbon monoxide are present if:

  • the engine or generator exhaust systems leak

  • insufficient fresh air is circulating where people are present

  • fumes move from the rear of the boat into the cockpit and cabin area.

To minimize the danger of CO accumulation when the engine and generator are running or when using burning fuel applications:

  • Be sure to have sufficient ventilation when using canvas or window-type side curtains when underway, anchored, moored or docked.

  • If the convertible top is installed, operate with the forward hatch open and leave the cabin door open.

  • Operate all burning fuel appliances, such as charcoal, propane, LPG, CNG or alcohol cooking devices, in areas where fresh air can circulate.

    Do not use such devices where there is no noticeable air movement, especially in the cabin, when anchored, moored or docked.

  • Do not idle the engine without moving the boat for more than 15 minutes at a time.

  • Inspect the exhaust system regularly.

High levels of carbon monoxide may accumulate in the following ways:

  • Blocking hull exhausts while operating at slow speed or if exhausts are submerged. 

  • Using canvas curtains.

  • Winds blowing exhaust toward boat occupants.

  • Operating engine or generator in a confined space.

  • Operating with the bow high.