Definition
Ground-based radio transmitters that broadcast a signal pilots can use to determine direction or position during flight. Early radio beacons along the transcontinental airway transmitted continuously so aircraft equipped with a compatible receiver could navigate toward or along a known course, including at night and in poor visibility.
Plain English
Radio stations on the ground that send out a signal a pilot's instrument can pick up, so the pilot knows which way to fly to reach the station or stay on the right track.
Context Anchor
In this chapter, radio beacons appear in the history of the transcontinental air mail route, where they helped pilots follow long routes before modern navigation systems existed.
Derivation
From 'beacon,' an Old English word for a signal fire or signpost used to guide travelers. Earlier beacons were visual (fires, lights); a radio beacon does the same job using a radio signal instead of light, so it works at night and through cloud.
Why Pilots Care
Enabled reliable long-distance navigation and night flying before modern electronic systems existed.
Analogy
A radio beacon is like a lighthouse that the aircraft listens to instead of sees. The beacon stays in one known place, and its signal helps the pilot navigate.
Intuition Check
Do not think of a radio beacon as just a flashing light or a general warning signal. In aviation, a radio beacon is a known radio source used to help with navigation.
Example Sentence 1
Air mail pilots followed a chain of radio beacons across the country, allowing them to fly the route at night and in weather that would have grounded earlier flights.
Example Sentence 2
Ground crews maintained the radio beacons so pilots could navigate safely across the country at night.