We juuuuust plugged in this uBlox RTK F9P shield into USB and given the intense cost of these modules https://www.digikey.com/en/products/detail/u-blox/ZED-F9P-04B/15761778 we definitely had a nervous twitch but then we heard the "ba-dunk" of enumeration and wheeeewww it came up as a serial port. Heartened, we soldered on a right-angle SMA connector https://www.adafruit.com/product/1865 and connected a chonky active antenna https://www.digikey.com/en/products/detail/u-blox/ANN-MS-0/9817931 . Start up a copy of u-center and huzzah, there is GNSS data streaming out. Next up, we have to figure out what we want to use as the underlying transport layer from base station to rover - maybe an ESP32-S3 Metro https://www.adafruit.com/product/5500 and ESP-Now? more research is needed!

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