If there are known points such as NGS marks or my own within a mile of the area, I will shoot a couple of them to check later when back in the office. I shoot the Nail with each rover and check to see the 25-ft offset from the base and difference in height. I pull a tape or use a rod to set a Nail 25 Feet from the Base Point, trying to keep it on the same plane if possible. If I am using two Rovers, I use a thumb drive to copy the Localization file from DC1 to DC2. Use same controller/DC for Rover and Setup Rover. Setup Base with Local Coordinates (10,000, 10,000, 100 -assumed Coordinates), create Localization File. Setup my base on a known or unknown point on my site where I can keep an eye on it. Here is how I roll with RTK using SurvCE and Carlson Survey. Even in a state with a heavy CORS network and reliable VRS/RTN and good Cell Service like NC. I have come to a conclusion that using my own base is the only way to go. This is big jump forward for me over the two 4700's I was using a year ago. Should tighten up the vertical quite a bit but don't have a feel for that yet. I appears to me it makes things 3 to 4 hundredths better horizontal. Once I convert to the GPS base I get all the SV's and extra channels (signals). The Utah RTN is GPS and GLONASS only and no L5 signals. Be awhile before I know how good this works, my first impression is maybe tighten things up a few hundredths at most. GPS base anywhere you need one and when you need it not at a later time. I'm two days into this and it works really well. You should check into a known point if one is available. The base also collects a static file that can be processed as a check on the coordinate. Then the receiver is started as a GPS base with the RTN collected coordinate. Once the coordinate is collected the connection to the RTN is closed (no more use of expensive satellite internet data).
So the idea is to use the satellite WiFi to connect to the RTN and collect the coordinate for a temporary GPS base point.
Corrections don't use a lot of data but satellite data is expensive. 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. What I'm doing is using a satellite WiFi Hot Spot to connect to the internet. That works to collect data but not stake out, So there is a time delay or extra trip. So you need a base point with known coordinate or HERE key, collect static and post process. I work in areas (mountains or remote land) where there is no or at best spotty cell coverage. When in a cell coverage area all you need is a rover and connection to the server. I use a cell phone tethering WiFi hot spot. Normal way is to connect to the server via the internet. I use a real time network, in Utah a VRS (Trimble).