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46: Receive navigational aids for airplanes

There are ground stations that emit a signal that allow calculating your angle relative to it! If you receive two, you can determine your position.

I hear the one close to Hamburg! SDRangel has a decoder, of course! It outputs angles between 210° and 230°, which is pretty good! Don't think they are meant to be used from the ground.

The neat navigational map is from https://skyvector.com!

(Thanks, @fly_it!)