I use a real time network, in Utah a VRS (Trimble).. I does require a subscription. Normal way is to connect to the server via the internet. I use a cell phone tethering WiFi hot spot. When in a cell coverage area all you need is a rover and connection to the server.
I work in areas (mountains or remote land) where there is no or at best spotty cell coverage. So you need a GPS base station. So you need a base point with known coordinate or HERE key, collect static and post process. That works to collect data but not stake out, So there is a time delay or extra trip.
What I'm doing is using a satellite WiFi Hot Spot to connect to the internet. The hot spot I have needs to be stationary to work so using it is limited as you can't get more than 3-400 feet away from it and you loose signal. Corrections don't use a lot of data but satellite data is expensive. So the idea is to use the satellite WiFi to connect to the RTN and collect the coordinate for a temporary GPS base point. Once the coordinate is collected the connection to the RTN is closed (no more use of expensive satellite internet data). Then the receiver is started as a GPS base with the RTN collected coordinate. The base also collects a static file that can be processed as a check on the coordinate. You should check into a known point if one is available.
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I'm two days into this and it works really well. GPS base anywhere you need one and when you need it not at a later time. The OPUS solution is a check. Be awhile before I know how good this works, my first impression is maybe tighten things up a few hundredths at most.
The Utah RTN is GPS and GLONASS only and no L5 signals. Once I convert to the GPS base I get all the SV's and extra channels (signals). I appears to me it makes things 3 to 4 hundredths better horizontal. Should tighten up the vertical quite a bit but don't have a feel for that yet.
This is big jump forward for me over the two 4700's I was using a year ago.