I have to say I'm in the old school camp when it comes to open cockpit wood and fabric planes, steam gauges all the way (and yes, leather helmet and silk scarf!). That said, I do have a (wooden) cradle for my smartphone in my plane. The smartphone runs Avare, which I use for navigation and flight logging.

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For my new plane, I made a kneeboard specifically to hold a 7" tablet. I have to fly the plane 1000 miles to get it home, and don't want to deal with paper charts in an open cockpit. The larger tablet will just make it easier; dealing with an unfamiliar plane over unfamiliar territory I want to focus on the plane, not the navigation.