Safety at sea Mobwatcher is a wireless man overboard system that replaces the classic dead man’s handle safety device. You hang a modern-day lifesaver around your neck, giving you unrestricted freedom of movement on board. Safe when you are fishing, mooring, fendering off, or have to fix something on board. And on land Mobwatcher also functions as an electronic anti-theft device and immobilizer when the boat is in harbour. The boat will quite simply refuse to start without your personal driver’s device.