I use some Sparkfun RTK boards with F9P and also with NEOD9S and wondering if you can support me with application reports and code examples for the Pi5
We don’t have a guide specific to pi/5, but here are their respective guides:
https://learn.sparkfun.com/tutorials/gps-rtk2-hookup-guide#hardware-overview
https://learn.sparkfun.com/tutorials/gnss-correction-data-receiver-neo-d9s-hookup-guide#hardware-hookup
You can pass the data over a the plain USB port (after configuring such in u-center) to the Pi; also be sure to grab the libraries mentioned, and presto!