The closest understanding I have to this is that pilots follow “sky highways,” but how do pilots know they’re still in their assigned highway? Doppler? GPS? Practice? Cloud magic?
PS please pardon me if the flair isn’t correct, I wasn’t sure what to file it under
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The flight coridors are seperated by altitude. Flights going east keep to odd hundreds of feet and flights going west keep to even hundreds of feet. They all use a barometer calibrated to the same value for sea level and a magnetic compass. Even if these technically show wrong compared to true altitude and true heading any fancy GPS, radio navigation or innertial navigation instruments need to calculate what a simple barometer and magnetic compass would show because this is the standard. So as long as everyone follows these rules there are always at least a hundred feet between airplanes flying in different directions.
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