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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.
u blox zedsparkfun electronicsgps rtksmakit
https://3dr-docs.netlify.app/gps/zed-xpico/
u-Blox ZED and xPico 200 series WiFi - Knowledge Base
u blox zed200 seriesknowledge basewifi
https://3dr-docs.netlify.app/gps/gps-zed-f9p/
u-Blox ZED-F9 RTK L1/L2 GPS - Knowledge Base
u blox zedl1 l2knowledge basef9rtk