Thank you for your post.
Can you please try the following:
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. It also depends on the environment you are in. You can send a screenshot if you want then I can recommend settings.
3. Make sure that Battery Saver is turned off, when the battery saver is turned on, it will diminish the performance of the GPS. Ensure that you don’t have it set to Optimized because that can cause issues with GPS and Bluetooth connectivity. With the release of Android 9 and 10 there are built-in low-power integrations that can cause that issue when it goes to sleep many functions are halted or put on reduced performance to conserve battery life. This includes GPS function since it isn’t an essential service to be running while the screen is turned off.
For some users, if you change the setting for location services from “While using the app” to “Always” it seems to have worked. This is because of those integrated battery saving options I mentioned earlier. Sensors like GPS, Bluetooth, etc. get less power when the screen is closed.
If that doesn’t work, can you please email our support team at firstname.lastname@example.org. We will be able to assist you further through email, as we will need to see some screenshots and additional info.