From: Leeuwarden, Netherlands
I have something similar on my smartphone, with "Layar" an augmented reality program I can use "Casper", a program which follows all the planes in the sky above me. All I have to do is point or aim the phone to the part of the sky I want to see and the program automatically detects the planes, whether I can actually see them or not. I also show all the side information like what plane it is, where it's destination is and so on.
So in the old days I could see planes overhead, but *now* I can know all about it, type, destination, and so on... pretty cool if you ask me.