Why make it complicated? The easiest and cheapest way to connect an iPad with panel avionics is to create a portable, plug-in WiFi network. That’s precisely what Dynon has done with its $35 miniature WiFi adapter.
Garmin, Aspen, FreeFlight and others have wireless interfaces, but they all require FAA-certified wired transmitters that mount in the bowels of the aircraft. That can’t be done for $35, but Dynon can by using its secure WPA2-protected WiFi link. The thumb drive-sized device has an integral wireless transmitter, while new operating software enables connectivity with ForeFlight’s Mobile iPad navigation app.