Good app for satellite information visualization! GPS Test Tool (Gnss Viewer) is a simple and easy-to-use GPS tool on Android system, it supports automatic detection of GPS on Android devices,you can check the GPS reception in your area and update AGPS data for faster fix times,whilst being able to view other GPS and sensor data.It supports GPS, GLONASS, GALILEO, SBAS, BEIDOU and QZSS satellites. GPS Test Tool has nine different functions: 1.Number of GPS satellites 2.Satellite signal strength