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The error occurs in NAV made as well when the D180 is taking input from the GPSMap495. Would the EDC-10A still have an effect then?

I have been having an issue with my AP74 on a D180 for over a year and cannot resolve the issue. The AP holds ALT perfectly for hours at a time but the HDG, TRK and NAV modes all have a similar issue. The AP holds direction perfectly for a while, from a few minutes to half an hour and the...