1. Turn the phone off/on.
2. Turn GPS off/on.
3. Be sure TRACX (or from the respective event) is allowed to use your location. Settings > Apps > TRACX (or from the respective event) > Permissions > Toggle Location ON. Be sure that you've allowed TRACX (or from the respective event) to use GPS in the background.
4. Disable any battery saver settings including Power Saving Mode, Battery Management, Optimization, or any third-party apps. More information on specific devices running Android 6 or higher:
   1. HTC: Settings > Power > Battery optimization > Not optimized > All apps > TRACX (or from the respective event) > Don't optimize > Done.
   2. Huawei: Turn Energy Settings to Normal and add TRACX (or from the respective event) to “Protected Apps.” or Settings > Apps > Advanced > Ignore optimizations > Allowed > All apps > TRACX (or from the respective event) > Allow.
   3. LG: Settings > Battery & power saving > Battery usage > Ignore optimizations > turn ON for TRACX (or from the respective event).
   4. Motorola: Settings > Battery > select the menu in the upper right-hand corner > Battery optimization > Not optimized > All Apps > TRACX (or from the respective event) > Don't Optimize.
   5. OnePlus (using OxygenOS Settings): Settings > Battery > Battery optimization > select menu at the top > switch to All apps list > TRACX (or from the respective event) > Don't optimize.
   6. Samsung: Settings > Apps > select the menu in the upper right-hand corner > Special access > Optimize battery usage > All apps > Toggle OFF for TRACX (or from the respective event).
   7. Sony: Settings > Battery > select the menu in the upper right-hand corner > Battery optimization > Apps > TRACX (or from the respective event).
   8. Xiaomi (MIUI OS):  Settings > Additional Settings > Battery & performance > Manage apps battery usage > apps > TRACX (or from the respective event). Or Settings > Additional Settings > Privacy > Location > ensure you are using High Accuracy for Location Mode and allowing location access.
5. Check that your location settings are set to High accuracy. Settings > Connections > Location > Locating method > High accuracy.
6. Try using the TRACX (or from the respective event) app to record for 10 minutes, letting it search for signals with a wide-open view of the sky, and keeping it completely immobile. If this does not produce useful location estimates, determine if GPS works in other apps. It's best to use another fitness tracker app and not a navigation app like Google Maps, Waze, or Apple Maps. Navigation apps use cell towers to snap your position to known roads and trails which can give the illusion that your GPS is working perfectly. TRACX (or from the respective event) and many other fitness apps do not do this and just use GPS to position you. Because of this, you may notice TRACX (or from the respective event) is having a hard time locating you but other navigation apps aren't.