Remove the SD card and check it on a computer. Ensure the folder named "NaviOne" contains the NaviOne.exe file.

—the status where a receiver successfully processes signals from at least four satellites to determine a precise position. Federal Aviation Administration (FAA) (.gov) 1. Critical System Requirements

: The most frequent "fix" isn't a software repair but a setting adjustment. Go to your device's Setup/Settings and verify that the GPS Navi Path points correctly to the Navione.exe file on your SD card.