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https://www.sparkfun.com/sparkfun-gps-rtk-sma-kit.html
SparkFun Electronics GPS-RTK-SMA Kit with u-blox ZED-F9P - SparkFun Electronics
The GPS-RTK-SMA Kit is a turnkey solution for 10mm RTK accuracy, with the ZED-F9P breakout, a compatible multi-band L1/L2 antenna and a heavy-duty ground plate.
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https://evelta.com/7semi-zed-f9p-dual-band-gnss-rtk-sma-modem/
7Semi ZED-F9P Dual-band GNSS RTK SMA Modem - Centimeter-Level Accuracy
Discover the 7Semi ZED-F9P Dual-band GNSS RTK SMA Modem for high-precision navigation. Featuring centimeter-level accuracy, multi-band GNSS, and RTK...
zed f9pdual bandgnss rtksmamodem
https://www.sparkfun.com/sparkfun-gps-rtk2-board-zed-f9p-qwiic-gps-15136.html
SparkFun GPS-RTK2 Board - ZED-F9P (Qwiic) | GPS RTK Board - SparkFun Electronics
The SparkFun GPS-RTK2 Board delivers 10mm RTK accuracy with the u-blox ZED-F9P module, with rover/base station modes, a U.FL connector, and I2C connectivity.
sparkfun gpszed f9pboardqwiicrtk