The software reaches approximately 98-99 % accuracy when you are outdoor and with clear sky. It works the same as the GPS devices mounted in cars. However, to increase the accuracy, make sure you are in an area without clouds and the NOAA data files are activated within the application. Additionally, turn on the GPS location on your device and make it to be most accurate. It might drain the battery faster, but you will have a perfect accuracy when the application is used.