I upgraded my portable Garmin GPSMAP 396 to a GPSMAP 696 to get out from under XM satellite fees and to take advantage of free ADS-B. Although the 696 is about the same size as an iPad mini, it’s still roughly three times larger than my 396. This was a bit of a problem. Because my RV-4 does not have a lot of available real estate, almost any fixed holder would complicate getting in or out of the aircraft.
The solution was to build a universal mount that easily folds out of the way. I used some scrap 3/32-inch aluminum, scrap piano hinge, and a folding lid brace that is available from most hardware stores for under $5. The mount bolts to the underside of the cockpit rails, and the fabricated brace end attaches with some spray adhesive. The display just mounts with Velcro strips.