It is 40' off consistently throughout the climb, e.g. when 5000' true (and tranmitted via xpndr) my HDX show 4960'. It is not off by a %. At field elevation, I am 40' off.
I just had the Pitot/Static and XPNDR test done by a qualified technician. He dialed the test to 10,500' and my Dynon altimeter showed 10,460'. Is there a way that I can dial in a 40 foot correction in the Dynon HDX system ? If so, how ?