This is my first post so hello all!
has a Raymarine autopilot
fitted with P70 control head
ACU200 controller and EV1 heading sensor.
I have an ongoing problem that the heading displayed will occasionally change by about 30 degrees.
I have calibrated the heading sensor numerous times and also used locked and unlocked calibration but the problem still occurs.
The indicated heading can change in the middle of a leg when nothing else has changed. It does not seem related to other electronic equipment
usage or fridge turning on or off etc.
Just as mysteriously it comes good for no reason.
There is nothing metallic near the EV1
The obvious first thing to try is a new EV1 but they are very expensive beasts.
Any thoughts sought be appreciated.