Couch to 5k, 5k to 10k and 13.one apps use GPS to track 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/13.one app
  6. Check While Using the App/Always 
Note: for Couch to 5k and 13.one, above steps will successfully get the GPS enabled. For 5k to 10k, please also follow below steps.
  1. Open 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/13.one app
  7. Tap Permissions
  8. Select On for Location 
Note: For Couch to 5k and 13.one, above steps will successfully get the GPS enabled. For 5k to 10k, please also follow below steps.
  1. Open 5k to 10k app
  2. Go to Settings
  3. Tap Workout Options
  4. Turn on Use GPS