Columbus V-800 high accuracy GPS receiver (Mark II)
Tindie Blog | Small, Low Power, High Accuracy GPS!
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:
High Precision Multi GNSS Receiver in China | Mulberry
Amazon.com: Dual Band GPS Module with RTK Function, High Accuracy GPS Expansion Board for Multi Signal Reception : Electronics
SIM33EAU GPS Module - Parallax
GW16143 High Precision GPS Mini-PCIe Card - Gateworks Corporation - Single Board Computers
UM980 module board High precision GNSS full frequency low-power RTK di – TOPGNSS.store
GPS - High Speed, High Precision GPS for Arduino from neoPLC on Tindie