A boat moves in all directions at once, and this sensor picks up every single pitch and yaw. It connects to the internal guts of the steering equipment, feeding back information about how the vessel is reacting to the sea. You might notice your autopilot acting much more natural once this is installed, as it stops overcorrecting every time a wave passes underneath. It creates a much calmer experience for everyone sitting in the cockpit, especially when the water gets rougher than expected.
Raymarine boat motion sensor
Robust motion sensing for reliable vessel orientation.