[CA] [CA11] Autopilot heading and COG intermittent mismatch

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Rod,

The reported symptom may be indicative of a problem with the software within the system's devices, a problem with the location of the source of GPS data for the system (may require that an external GPS sensor be installed in a location affording it an unobstructed view of the skies overhead, a problem with the source of GPS data for the system, or a problem with the system's Data Master MFD which is sending navigational data to the autopilot. Accordingly, the first step would be verify that each of the components within the system has been updated with the latest available Raymarine product software updates. Please note that any update to the autopilots software will require that an Autopilot Factory Reset be commanded and that the actions specified within the FAQ found here be undertaken afterwards. Please additionally verify that the MFD which has the least obstructions to the skies overhead has been designated at the system's Data Source for GPS data, Time & Date, and Datum. Should the problem persist afterwards, then respond with:
- the Diagnostics...html file for this system
- photos of the EV-1 CCU and the surrounding area (at least 3' in all directions
- photos of the GPS data source's installation location to include surrounding and overhead structures.