One such app is Gaia GPS, but the following tips for how to preserve battery life in the backcountry can apply to any time you’re using your phone in the wild.
- Download maps before you go offline
- Use Airplane Mode
- Avoid Exposing your phone to extreme temperatures
- Shut down apps you don’t need
- Customize location services
- Lower screen brightness
- Turn off your phone when you don’t need it
- Bring a backup power source

Check out the details of the list here.