Most power boats and PWC's are equipped with an:

Most power boats and personal watercraft (PWC) are equipped with an emergency ignition safety switch to enhance safety during operation. This device is designed to stop the engine if the operator becomes detached from the vessel, which is especially important in situations where a driver might fall overboard or be incapacitated. The emergency ignition safety switch is often connected to a lanyard that the operator wears, ensuring that the engine will shut off if the lanyard is pulled free.

While automatic ballast systems, integrated GPS systems, and fuel management systems are features found on some boats and PWCs, they are not standard equipment on the majority of these vessels. The primary purpose of the emergency ignition safety switch focuses on the immediate safety of the operator and is a legal requirement on many boats, making it the most prevalent safety feature in this context.