OnTrack - Mountain Bike Route Following
Keeps you on route when Cycling, Running or Walking by giving a clear voice prompt if you go off track.
With OnTrack import up a route from a GPX which can be exported from Strava or Garmin etc and followed.
While following the app with give you audio cues when you go Off Track, which will work while listening to music too!
Continued use of GPS running in the background can dramatically decrease battery life.