> Not really. Maybe in part 121/135 ops (not sure, I don't fly that) but that's definitely not the norm in part 91. From an ATC perspective there’s a bunch of

> Not really. Maybe in part 121/135 ops (not sure, I don't fly that) but that's definitely not the norm in part 91. From an ATC perspective there’s a bunch of possible position sources for an aircraft; MLAT, ADS-B, CPDLC/ADS-C, primary radar, SSR as well as verbal position reports from pilots, depending on a combination of location and ATC and aircraft capabilities. The ATC system is responsible for fusing these sources to paint a track on the screen for the controller. The system (at least Eurocat and TopSky, I can’t speak for others) will throw errors if these sources don’t agree. The controller will ask questions if the pilot says one thing and the display in front of them says another. There are established procedures for dealing with transponders transmitting garbage, for example. If you’re tooling around in Class G in your part 91 op, then for the most part nobody’s really watching you anyway.