FabFM Radio Kit - KIT-11043 - SparkFun Electronics
2- XBee S6B Radio Modules/USB Sparkfun.com Brd. Serial Communication Over WIFI | eBay
RTK Surveying Kit - SparkFun | Mouser
GitHub - sparkfun/SAMD21_Pro_RF: The SparkFun Pro RF is a LoRa®-enabled wireless board that marries a SAMD21 and a long-range RFM95W to make a compact and easy-to-use IoT Arduino board.
SparkFun RTK Facet Hookup Guide - SparkFun Learn
SparkFun GPS-RTK Dead Reckoning pHAT for Raspberry Pi | Elektor