Benefits of ADS-B
Apart from allowing cool apps on iPhones to watch traffic coming and going, what enhancements/safety benefits does ADSB transponding bring to ATC. It doesn't add anything to mode s data does it ?
Also, why is it that I can only see aircraft in my phone app once they're airborne ? Is the data that my iPhone picks up trasmitted from the aircraft or via the radar ground station ?
Many thanks.