blog.nasm.si.edu
Lighthouses
I was perusing that perennial bestseller, the FAA’s “Aeronautical Information Manual,” the other night, and ran across an intriguing reference to code beacons and course lights. Code beacons, in general, flash identifying information in Morse code; coded course lights are used with rotating beacons of the Federal Airway System, are highly directional, and are paired back-to-back pointed along the airway. What interested me was the appended note: