Re: Mode S
I took the information with a pinch of salt as it was listed under a "Future Developments" heading, which I assumed to mean that it wasn't a fundamental part of controlling yet. In light of what you've written, could you give a very brief overview of the 3 main characteristics of it (or at least NATS tell us there are 3), and how it manifests itself IE. is it simply another radar screen?
I realise all this knowledge in detail isn't needed right now, but it's certainly interesting.