What is the role of a kill switch on a boat?

The role of a kill switch on a boat is primarily to enhance safety by shutting off the engine if the operator falls overboard. This mechanism is particularly important because it helps prevent the boat from continuing to operate without supervision, which could lead to accidents or further risks to the operator and others in the vicinity. When the kill switch is activated, it disables the engine, preventing the boat from moving or causing harm.

The other options do not accurately describe the primary function of a kill switch. While improving fuel efficiency, sounding alarms, or preventing theft are important considerations for boat operation and security, they are not the main purpose of a kill switch. The kill switch is specifically designed as a safety feature to address the critical situation of an operator becoming incapacitated while on the water.