Where must you attach an engine shutoff line when operating a portable water craft?

When operating a portable watercraft, the engine shutoff line, also known as the kill switch, should be securely attached to the operator's person or clothing. This ensures that if the operator falls overboard or leaves the helm, the engine will shut off immediately, preventing the craft from becoming unmanned and potentially causing accidents. It's crucial to check that the shutoff line is properly connected before starting the engine.