What maintenance action should be done monthly to prevent CO poisoning?

Checking the operation of each carbon monoxide (CO) detector monthly is essential for preventing CO poisoning. CO is a colorless, odorless gas produced by engines, generators, and other fuel-burning appliances, and it can accumulate in enclosed or poorly ventilated spaces on a boat. Ensuring that CO detectors are functioning properly is crucial, as these devices can alert occupants to dangerous levels of carbon monoxide before symptoms of poisoning occur.

Routine maintenance of CO detectors involves testing the alarms, which often includes pressing a designated button on the device to verify that it beeps or signals properly. If any detector is malfunctioning or its battery is low, it can be replaced immediately to maintain a safe environment on the water. This action greatly contributes to the safety of everyone aboard by providing an essential early warning system against CO exposure.

While inspecting life jackets, testing the boat's speedometer, and replacing the fuel filter are also important maintenance tasks, they do not specifically address the risk of CO poisoning in the way that checking CO detectors does.