I’m pretty sure that the rudder sensor on our Raymarine AC400 Evolution Pilot has failed. Certainly the boat goes into increasing oscillations as it attempts to follow a heading and the display does not show the rudder applied. I tested the resistance across the sensor and got the following figures which have little resemblance to what they should be

Red / Green 24.5 ohms (should be 5k)
Red / Blue 1.436k ohms (should be 1.5 to 3.5k depending on helm)
Blue / Green 1.26k ohms (should be 1.5 to 3.5k depending on helm)

I will replace the sensor when I get a chance but my question is: can the AC400 be safely operated WITHOUT a rudder sensor?

Simon