I had planned on mounting the Garmin magnetometer aft of the baggage compartment. Since I have a Dynon 10 redundant EFIS, it also has a magnetometer. I elected to mount both in the same location. I downloaded an app on my iPhone called a magnetometer reader, or something like that. It shows no interference with anything in this area including either magnetometer, the longerons, the GSA28 servo for pitch trim or the Aerosport air handler.
