I continue to be baffled by assertions that ADS-B is simpler and cheaper than a Mode S transponder. ADS-B transmits your position over a simple data link. The data link which almost all countries of the world have agreed to use for that ADS-B transmission is a Mode S transponder. (The exception is the USA which intends to allow the ADS-B transmission to be made EITHER on Mode S, OR on the UAT data link pioneered in Alaska).
Since most ADS-B installations will therefore comprise a Mode S transponder plus a GPS receiver, in what way is that going to be cheaper than a Mode S transponder alone?
