GPS One is an Android application developed by Repsac.Net that exercises Android positioning features. It is an excellent tool for users who want to check their device capabilities and for device manufacturers and positioning technology engineers to ensure their implementations are correct with regards to the Android framework.

The application covers a wide range of features, including GNSS (Global Navigation Satellite Systems), Network Positioning, Fused Location, Geofencing, and Automation. It leverages on GPS (USA), GLONASS (Russia), BeiDou (China), Galileo (EU), QZSS (Japan), NavIC (India), and SBAS (Regional) to compute accurate locations. It also uses Google's knowledge of cell towers and Wi-Fi access points to compute coarse locations.

One of the most useful features of GPS One is the ability to repeat GNSS starts/stops to benchmark device performances, including TTFF (Time To First Fix) and HE (Horizontal Error compared to a reference location) percentiles in Cold/Warm/Hot start conditions. The geofencing feature sends user alerts when crossing predefined fences, making it an excellent tool for travelers.

Overall, GPS One is a comprehensive tool that offers a wide range of features to exercise Android positioning. It is easy to use and navigate, making it an excellent choice for both novice and advanced users.