Xamarin/C# app for Android which helps you in your bicycle trips. It lets you load GPX track and then it plays audio whenever you are off-track or you lost GPS signal.
Single sonar ping sound is extracted from the file: http://www.zedge.net/ringtone/1419653/ KDE_Error audio file is converted from KDE3 sounds.
Please use Visual Studio 2017 or compatible tool. You need GPX library: https://github.com/macias/Gpx
I need moderately priced, e-ink, around 5" device with GPS and ability to run custom apps. The problem is it does exist, there are some options like:
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Yotaphone -- too expensive,
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dedicated bicycle GPS -- nano screens,
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DIY hybrids -- e-reader with wifi getting GPS data from smartphone.
All of them means paying extra cash for far from perfect solution. Until the dream device comes true I decided to re-use what I have -- Android Gingerbread smartphone -- and since it is completely unreadable in the sun I opted for audible feedback.