BathyLogger Facet RTK GPS Base and Rover kit - RRS222 | eBay
SparkFun GPS-RTK-SMA Kit - Includes GPS breakout- Magnetic Mount Antenna- Ground Plate & USB-C Cable - u-Blox ZED-F9P & RTK- High precision accuracy in milimeters- Both Rover & Base station operations: Amazon.com:
GPS & Compass Hex / Proficnc Here GPS2 Port Here+ RTK GNSS (M8P) HX4-06004 – SPEXDRONE-STORE