cool freature that might have application in FlightAware,
f0p.de/cgi-bin/shop.cgi?rada … prache=eng
Missing an important item: aircraft type
That page is a rather weird web site.
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First it says “Live”, but the ‘description’ calls it a “simulation”.
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The ‘equal flight time’ circles are actually circles superimposed over a map. That means that all aircraft have equal ground speed. Also it means there is no headwind/tailwind, which would distort the circle, spreading apart the tailwind direction and compressing the headwind direction.
I don’t think I can accept the flight positions as true under those circumstances.