Have one Reach RS and a correction service, want to measure GCPs in real time

I’m a newbie when it comes to professional GNSS and my question is related to a recent one by l3technologycambodia.
I have one Reach RS and access to a free, national DGNSS correction service (http://euref-fin.fgi.fi/fgi/en/positioning-service/dgnss-service). I want to measure GCP coordinates for drone mapping. I get a connection to the service in the ReachView app, but I’m not sure which app settings to use to get it working at cm or even dm accuracy, it’s more like 1-2 meters. The manuals are generally referring to a base/rover setup with two Reaches.
Can someone please point me in the right direction?

Hi Romi
If you take a look at this picture

And info about DGNSS, and how accurat this type of correction is

You see that, at best you get around 50cm accuracy and the accuracy of the correction decreases as the distance to the station increases.

Here is a picture of basic setup. You see i get a dropdown menu and are able to select mountpoints

You might change the RTCM version as well.

Thanks a lot, this was exactly what I needed to know. PPP or another Reach RS and I will get <10 cm accuracy.