What is a crucial step to take when a boat is close to swimmers?

Turning off the engine is crucial when a boat is near swimmers for several reasons. First, it significantly reduces the risk of accidents. A running engine can create a dangerous situation where swimmers may accidentally come into contact with the propeller, leading to serious injuries. Additionally, a quiet engine allows for better communication with the swimmers, making it easier to alert them to the presence of the boat and ensure their safety.

While other actions like turning the boat away from the swimmers or calling out to them might seem important, they may not provide the same level of safety as turning off the engine. Maintaining speed or simply trying to pass quickly could exacerbate dangers, while turning away may not adequately protect swimmers who could be in the path of the boat. The safety of swimmers should always be the top priority when boating in close proximity to them.