Great! I’m planning to do the same thing next year in order to precisely map some hiking trails. What sort of board did you use for the uBlox F9P? What I was looking at is this spark-fun rtk kit https://www.sparkfun.com/products/18589 plus another stand-alone surveyor and radio to use as a base-station when there is not cellular coverage.

Have you considered having another uBlox F9P acting as a base station and sending corrections over radio? for example on the top of the gorge in your case. Although this still won’t cover all cases, it helps you cover a lot more.

Was that power bank enough, was autonomy a problem? What about the cost of the setup?

Thank you for sharing this!