ArduSimple simpleRTK2B Multiband Real-time Kinematic (RTK) Application Boards are standalone application boards that allow users to evaluate multi-band global navigation satellite system (GNSS) technology including RTK functionality. The boards are based on the u-blox ZED-F9P module and are fully compatible as a shield with Arduino, STM32 Nucleo, Raspberry Pi, or as an external GNSS for Pixhawk autopilots. simpleRTK2B is a cost-effective shield that supports multi-constellation (GPS, GLONASS, BeiDou, and Galileo) and multiband GNSS receivers. The series offers <1cm precision(1σ) with base-rover configuration, <1cm with NTRIP corrections, or <10cm with SSR corrections. The boards are 3.3V and 5V compatible (UART voltage levels are adjusted automatically based on power source voltage). ArduSimple simpleRTK2B Multiband Real-time Kinematic (RTK) Application Boards can be powered directly from the Arduino headers or via a micro USB connector from the simpleRTK2B board.