Couch to 5k, 5k to 10k and apps use GPS to track your progress with total distance and average pace. To activate GPS for your phone and the app, follow these steps:
IOS users:   
  1. Go to Phone Settings
  2. Tap Privacy
  3. Tap Location Services
  4. Select On for Location Services
  5. Tap Couch to 5k/5k to 10k/ app
  6. Check While Using the App/Always 
Note: There is no need to follow the steps below for app.
  1. Open Couch to 5k/5k to 10k app
  2. Go to Settings
  3. Tap Workout Options
  4. Turn on Enable GPS
Android users:    
  1. Go to phone Settings 
  2. Tap Location
  3. Select On at the top of screen
  4. Tap Applications
  5. Tap Application Manager
  6. Tap Couch to 5k/5k to 10k/ app
  7. Tap Permissions
  8. Select On for Location 
Note: The Enable GPS part has been removed from the Couch to 5k/5k to 10k  app Workout Options since the latest  release.