What should you avoid doing in confined spaces on a boat?

Idling the engine in confined spaces on a boat should be avoided due to the risk of carbon monoxide buildup, which can lead to serious health risks or even fatalities. When a boat's engine runs for an extended period in an enclosed or poorly ventilated area, the exhaust can accumulate, creating a dangerous environment. Carbon monoxide is odorless and colorless, making it particularly hazardous since individuals may not realize they are being exposed until it is too late.

In contrast, options like keeping windows open can actually improve ventilation and help dissipate carbon monoxide. Storing life jackets is a crucial safety measure and should always be done properly, without any hazard to the crew or passengers. Using navigation equipment does not pose a threat in confined spaces, as it is essential for safe boating practices and does not contribute to harmful conditions. Thus, avoiding the idling of the engine is critical for maintaining safety while operating in confined areas.