Raymarine's smart Evolution EV-1 sensor is the heart of the Raymarine Evolution system. It is a 9-axis heading sensor that can monitor ship movements in any direction. It guarantees dynamic precision to 2 ° in any conditions. The EV-1 is suitable for connecting mechanic and hydraulic autopilot systems. The EV sensor core is also waterproof and protected from water ingress in accordance with IPX6 and IPX7. Dimensions: Diameter (Ø): 18.8 x 3.5 cm.