Surveillance is not only a game of PI (private investigators) or the police. You can also have a surveillance gear (maybe not as sophisticated as wearable spy equipment or mini audio recorder measuring the size of your fingernail…) to keep tracking almost anyone you want. What I’m talking about here is GPS tracking system.
GPS tracking [...]

The only thing that I know for sure is that your FMS must be approved for GPS approaches. I thought that you also need some kind of annunciator in the cockpit telling you that the GPS has gone into the more precise approach mode. I fly a Lear 55C with dual UNS 1-Ds.