Send corrections Rtk

Hello good days , I saw this article
I understand all about module air, but I have to questions about ground. First , what do you use GPS in ground ?

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Could you rephrase your question, please?

Ok , sorry.
I want to say that , the base station need a GPS and I don´t know that GPS and software you used.

Im not fully sure i undestand your question, but could it be this:

The article refers to a Reach unit set as base station.
You can read about reach in the above link.