GNSS Master app allows you to:1) Connect to your external GNSS receiver via USB Serial (OTG), Bluetooth, BLE and TCP/IP2) Send corrections to your GNSS receiver from in-built NTRIP Client (V1 & V2), and PointPerfect3) Output your GNSS receiver data to NTRIP Server (V1/V2), TCP Client or TCP Server4) Use high accuracy position from your receiver directly with SW Maps, and with all other Android apps via Mock Location5) Change your u-blox/Septentrio receiver configuration to Rover, Base or load any custom configuration file