Yotaphone (120 €) has 2 screens: a classic color screen, and at the back an e-ink screen (like eReaders).
There it is, connected to leGPSBip with XCTrack: the perfect instruments combination for regular flights with display or advanced cross-country flights with livetrack.
And of course, leGPSBip by itself remains the solar-powered GPS tracker that will accompany you in all your hike&fly!