It’s the unique frequency boundaries on charts that has led us to the giant 40 mile 5000’ CTAFs
Under the government approved NAS it particularly stated that a major change was removing the frequency boundaries. That was so pilots could concentrate on monitoring the aerodrome frequency if flying in the arrival and departure area of that aerodrome . And it worked! The frequency boundaries were put back on by those who’s minds are clearly set in concrete
Triadic. Most of Australia is flat and as vhf is line of site the nearest ground outlet will give you the maximum range. That’s why any good aviation GPS has a nearest ATC / FS function.
Check board Now with ADSB most IFR pilots do not give full position reports on atc frequencies. How then does a VFR pilot know when to respond?
Last edited by Dick Smith; 22nd Dec 2017 at 14:28.