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Or... If you've seen the Google Skymap app, you know that it's possible to determine what part of the sky the phone is pointing at in addition to where the phon

Or... If you've seen the Google Skymap app, you know that it's possible to determine what part of the sky the phone is pointing at in addition to where the phone is located. That gives you a rectangular cone which contains everything the phone can 'see'. A little geometry and the flightpath data and you can figure out which flights are passing through the cone and how far away they are; the close ones are probably the ones the user is interested in.

TGJ 16y ago
That sounds neat. I didn't now about the Skymap app. I've stopped browsing apps since my Iphone went through the washer. It goes to show that there are many ways to achieve the desired goal, so the real issue is not ADS-B systems but freedom vs. safety and how much are we will to give of one to get the other.