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

The function of the kill switch on a boat is to shut off the engine if the operator falls overboard. This safety feature is crucial as it helps to prevent accidents that could occur if the boat continues to operate without control. When the operator is thrown from the boat, the kill switch, usually attached to a lanyard worn by the operator, is pulled out, cutting the engine's power and stopping the boat. This helps to reduce the risk of injury to the operator and avoids the potential for the boat to drift unchecked or circle back, posing additional dangers.

In contrast, options related to boosting engine speed, activating emergency lights, or controlling the navigation system do not accurately reflect the role of the kill switch. The primary purpose of the kill switch is centered around safety and ensuring the operator can quickly stop the vessel in a critical situation.