What about RTK/PPS? Here's a module that implements them along with GPS and GGNS. https://www.sparkfun.com/sparkfun-gps-rtk2-board-zed-f9p-qwiic-gps-15136.html

What about RTK/PPS? Here's a module that implements them along with GPS and GGNS. https://www.sparkfun.com/sparkfun-gps-rtk2-board-zed-f9p-qwiic-gps-15136.html https://www.sparkfun.com/sparkfun-gps-rtk2-board-zed-f9p-qwi... The datasheet: https://cdn.sparkfun.com/assets/f/8/d/6/d/ZED-F9P-02B_DataSheet_UBX-21023276.pdf https://cdn.sparkfun.com/assets/f/8/d/6/d/ZED-F9P-02B_DataSh...