The Transcontinental Airway System was a navigational aid deployed in the United States during the 1920s.
1928 Commemorative Beacon on Sherman Hill
Light, tower, shed, and concrete arrow
The remnants of Transcontinental Air Mail Route Beacon 37A, which was located atop a bluff in St. George, Utah, in the United States. With concrete arrows indicating the direction of the next beacon, a rotating light tower, and a shed that usually held a generator and fuel tanks, these beacons were once situated every 10 miles (16 km) along air routes across the United States beginning around 1923.
A concrete arrow of the former Transcontinental Airway System in Walnut Creek, California, in August 2018.
Radio navigation
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Radio navigation or radionavigation is the application of radio waves to determine a position of an object on the Earth, either the vessel or an obstruction. Like radiolocation, it is a type of radiod
Transcontinental Airway System
…totaled 1,500 beacons and 18,000 miles (29,000 km). The lighted airway beacons were a substantial navigation aid in an era prior to the development of radio navigation. However, their effectiveness was limited by visibility and weather conditions. The rotating beacons were 24 inches (610 mm) in diameter, mounted on…
Amelia Earhart's Lockheed Electra had a prominent RDF loop on the cockpit roof.
The Orfordness Beacon as it appears today.
VOR transmitter station
Cessna 182 with GPS-based "glass cockpit" avionics