The Crowtail - GP02 module is a cost-effective and field programmable gadget. The high-performance BDS/GPS/ GLONASS multi-mode satellite navigation receiver SOC module, integrates RF front-end, digital baseband processor, 32-bit RISC CPU, power management and active antenna detection and protection functions. Its positioning accuracy is about 2m and can provide a maximum 5Hz, <0.1m/s accurate and real-time positioning rate. It supports a variety of satellite navigation systems, including China's Beidou satellite navigation system BDS, the United States' GPS, and Russia's GLONASS, and can realize multi system joint positioning.