Educate me about aircraft squawk codes.
As a side note, why 0-7? That looks like a legacy from octal days.
My main question is why does the squawk code not match the designation for the plane? If your plane’s number is 5423, why not squawk 5423 and everyone will know who you are already? Or is that so limited by the 1960’s technology (only 4 digits 0-7, no alpha) that few planes could do it that way? Why not jump ahead to the next century with a better device?
If you fly into an area before communicating with a controller the first time, how does the controller and/or ATC display know to associate your squawk code with your airplane?
And if you can squawk 1200 to mean “I am flying visually…”, how does the controller know that *your *plane is the one transmitting the 1200? Couldn’t there be several in the same area sending the same code?
And what happens if two planes do send the same code, either due to a controller error, or because there are more than 4096 planes in the world (8x8x8x8) and there’s nothing to prevent a random two with the same code from appearing near each other?