There is always a risk of carbon monoxide accumulation when the engines are running, the boat is moving slowly or at a standstill,  or when using burning fuel-based devices. 

To minimize the danger:

• Do not rev the engines or idle them longer than necessary.

• Avoid using a canopy or side curtains. If you do use them, always ensure sufficient ventilation.

• If you have a convertible top, operate with the forehatch open and leave the cabin door open.

• Do not use fuel-driven appliances in the cabin or other closed areas when anchored, moored or docked. Only use them in areas where fresh air can circulate.

• Leave enough space between the engines and any obstacle.

• Inspect the exhaust system regularly.