Longitude, Latitude and a compass. Used with the good ol' sense of orientation and some maps.
It works on:
* Moto G
It does NOT work on:
Please write me an email, on twitter(@repat123) or leave a comment if the app (doesn't) work(s) on your phone.
Permissions: FINE_LOCATION(for GPS), COARSE_LOCATION(for WiFi/Cell)