Correction(Source)

This setting determines the method your system uses to receive RTK correction data from the base station.

Internet: Receives correction signals via an NTRIP server over a mobile network or Wi-Fi. This is the most common method but requires a stable internet connection and correctly configured NTRIP settings.
Radio: Receives correction signals directly from a local base station via radio frequency. This method is ideal for remote areas where cellular network coverage is poor or unavailable.

(Don't forget to press Set to apply your choice).