[CA] [CA11] Evolution sensor core and AC interference

[Chuck - Raymarine - Moderator]

Welcome back to the Raymarine Forum Dave,

I see a couple of possibilities here. The first is that air conditioning unit (or some other nearby device) has an excessively strong magnetic field associated with it.
Please click here to view a FAQ addressing this subject. The referenced FAQ describes one third party mobile app which may be used to detect magnetic field strength in the area of the EV-1 CCU. As indicated within the referenced FAQ, it is recommended that all electrical devices onboard be operated to determine their effects and/or the effects of the cables powering these devices upon magnetic north sensing devices. It would be recommended that the EV-1 CCU's installation location again be tested for sensed magnetic field strength and if found to be excessive, that the EV-1 CCU or device / wiring producing the magnetic field be relocated. It is unlikely that the proximity of the power cable to the backbone cable is responsible for the reported issue. As indicated within the referenced FAQ, equipment cannot be shielded from magnetic fields ... physical separation must be employed.

The second possibility (may be in combination with the first) is that a surge associated with powering the high current demanding equipment has affected the memory of the EV-1 CCU. Please click here to view a FAQ addressing this subject. After applying the correct isolation product for your application, then it would be recommended that the EV-1 CCU's installation location again be tested for sensed magnetic field strength. After doing so, it would be recommended that a Pilot Factory Reset, Dockside Wizard, and cruise to detect magnetics be undertaken again.