Even if your device is in the same place and environment, it may behave differently from one day to the next. usually, a device needs to receive signals from about five satellites to accurately estimate your location. Because the position of the satellites, weather patterns and the Earth's outer atmosphere change, you have no influence on different parts of the GPS system. The exact cause of erratic performance is therefore difficult to determine. We recommend you make several attempts to find out how your device's GPS works best in your environment.