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If you are locating yourself in an area where you are underneath heavy tree canopy cover or tall buildings, the communication between the device and GPS satellites may be obstructed. If the signal is obstructed, the app may not be receiving consistent or accurate GPS location fixes and that is why you are seeing the location dot jump around on the map.
If you are using the app to track, there are certain settings (Settings > GPS) that can determine if GPS location fixes are acknowledged and recorded on a map. For example, if you set the app to ignore all GPS location fixes that have a horizontal accuracy that is greater than 8 meters, and the app is being fed location fixes with a horizontal accuracy greater than 8 meters, then the app will acknowledge fewer fixes and your location dot may appear choppy.
If you continue experiencing issues, please contact us via the Support Centre form at help.avenzamaps.com > Get Help for us to be able to provide better support. In your support request, please let us know what type of device you’re using, if the location jumping is occurring in other apps (ie Google Maps), and whether you can confirm that you are online (connected to a cell network or Wifi) or offline (not connected to a cell network or Wifi) when you are locating yourself in the app.
Please let me know if you continue experiencing this issue!
All the best,
Avenza Systems Inc.