Hi Bookworm
I am working from deep levels of ignorance here, which is why I'm seeking enlightenment! Please excuse.
Correct me if I'm wrong but:- Collision avodance systems e.g. TCAS rely on a transponder return - no transponder, no collision warning triggering?
So if everyone has to change to Mode S, can the current TCAS systems which presumably work with Modes A & C also work with Mode S or do they all have change to TCAS II or whatever it is and will TCAS II still work with any residual older modes?
Ta