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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GPS and ground stations serving as radio beacons.
Also dispatchers watch them from the ground on radar and will ask to correct course if they deviate.
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