It can depend on one or more of the following things, the age of your rover, the mountpoint you select or the settings you choose in your survey software. There are new satellite constallations and signals that were only implemented in the past few years. An older rover may not be able to utilize all of the latest sats and signals it “sees”. In legacy VRS/MAC/FKP solutions, it would cull out some satellites that were not fixing, to create the corrections. Your rover would likely not use bypassed sats for the same reason. Some mountpoints support just a subset of the available sats so this could limit the number of sats you are using. Some survey software gives you the option to check a box for each constallation that you want to work with so any box left unchecked would remove those sats from your solution. Also note that your rover needs to use satellites that are in common with 6-9 surrounding CORS stations.

However, in April 2023 we implemented a new feature that includes more satellites for ranging, even if they are not among the fixed ones used in modelling the corrections. While this does not degrade results, it may not necessarily improve results. However, some tests and user feedback have shown it can improve quality and completeness, in certain situations that may have been challenging in the past, with limited satellites. Like in some sky-view challenged locations. In short, you now use more of the sats you see in your solutions (for newer rovers).