The AHRS is still a work-in-process on the Stratux side; therefore it is not recognized by iFly. However, it seems to be accurate when viewed in flight on the Stratux web page, so it may not be too long before it works with iFly. I believe the AHRS is independent of a GPS signal, but there's much discussion on the Stratux site about whether the AHRS should get its heading info from the GPS or the magnetic heading chip. Apparently the devil lives in those details and even certified units don't have a consensus on heading source.