Dynon Avionics EFIS-D10A Pilots Users Guide - Manual (Page 14)

Product Overview
EFIS-D10A Pilot’s User Guide 2-5
the EFIS-D10A’s attitude.
COMPASS ACCURACY AND AUTOPILOT PERFORMANCE
If you are using your EFIS-D10A to control Dynon’s Autopilot, it is critical that the magnetic heading be as accurate as
possible for comfortable operation in HDG mode and radio-based VOR/NAV mode. The aircraft’s compass must be
installed correctly, calibrated, and operating well in all attitudes. If you are currently only using EFIS-D10A’s internal
magnetic compass, Dynon strongly recommends the installation and use of the EDC-D10A remote-mounted digital
magnetic compass, and properly calibrating it per the instructions in the EFIS-D10A Installation Guide.