Most importantly. The FAA has installed over 600 ADSB ground stations with coverage down to 1000 agl over 90% of the land area .
When their very reasonable ADSB mandate comes in in 2020 are they going to have to change the NAS?
No. Because it's designed to work with modern survailance .
How can it possibly work without any ATC frequency boundaries marked on the charts so pilots at non mapped airports know which ATC frequency to jam when they are giving circuit and taxiing calls? It's all very mysterious!
But we certainly would not want to copy or even ask how it works. Remember we designed the Nomad. They designed the 747 and the Space Shuttle
Last edited by Dick Smith; 13th Mar 2016 at 07:31.