Polaris Connect app helps you to connect your Polaris S100 RTK receivers with a specified NTRIP caster via Bluetooth interface. You can then build an RTK system for centimeter precision positioning. Polaris NTRIP Server/Client supports NTRIP 1.0 protocol. Polaris NTRIP Client supports VBS-RTK (or VRS-RTK) services like e-GNSS，“千寻位置”. You can purchase Polaris Alpha+ Multiple-Frequency RTK Receiver from https://www.polaris-gnss.com Be sure to set "Settings->Developer Options->Mock location ap