# Configure rover

Configure an additional S900 as a rover. Communication mode should be set to Internal Radio. Measure from ground to ARP (bottom of S900) and input this as a vertical height in meters - Cube-A will automatically add the offset to L1 phase center. 

![Rover mode settings with SBAS disabled](https://content.gitbook.com/content/dEevfLZRIk38LUPwDa4V/blobs/PAwIGkV2lNyHMwoWCSkV/Screenshot_20210226-143721_Cube-a%20v5.jpg)

Ensure that the rover is listening for corrections at the correct channel and frequency via the Internal Radio menu. Set the protocol to TrimTalk 450S(T). Channel should correspond to the channel displayed on the Harxon radio.

![Internal radio settings configured to communicate with external base station radio](https://content.gitbook.com/content/dEevfLZRIk38LUPwDa4V/blobs/YjQTJ5M340vgrzFCb1oQ/Screenshot_20210226-143716_Cube-a%20v5.jpg)

If you have correctly configured the base station, Harxon radiomodem, and rover, your rover's position should be listed at the top of the home screen as fixed.

![Rover with fixed position](https://content.gitbook.com/content/dEevfLZRIk38LUPwDa4V/blobs/82Sp4YpzkV1TEPUhRYRO/Screenshot_20210302-175250_Cube-a%20v5.jpg)