Thank you for your post. The battery setting you have is correct, however, you may also need to change some other settings.
1. Ensure that you are using GPS Fixtures and not Network Fixtures. Network Fixtures are based on your cellphone’s connection to the nearest cell phone tower. A network connection for location accuracy is not as consistent, reliable, or precise as a GPS fixture. The easiest way to do this is to turn off your mobile network while using the app.
There is also a setting that can fix this:
iOS: Settings > Avenza Maps > Cellular Data > Turn off
Android: Avenza Maps > Settings > GPS > Only Use Satellite Fixes > Turn On
2. You can check your GPS Track Settings and apply the settings that apply to the environment you are in. For example, if you are experiencing inaccurate GPS readings while you are in an open field, you can change to Keep All Fixes and it will give you more readings so it will be more accurate for Time and Distance. Horizontal accuracy is a bit trickier.
3. You may also need to change your Location Services to Always on, instead of while using the app. Since, Android may consider the app not being used while your screen is turned off. The Location Services will be located in your device settings.
Let me know if that fixes your issue or if you continue to have problems.