411A , I seem to remember that the principles of ILS were German, by Lorenz if my memory is good, and was used during WWII by them.
You could well be right, ATC Watcher, however Sperry/Pigman held the US patents for ILS.
Reed Pigman especially was involved with many navigation systems and was also (later on) the CEO of American Flyers Airline.
He met a rather unfortunate end however when the Lockheed L188 he was commanding crashed just adjacent to Ardmore Oklahoma, many years ago.
Circling with a ceiling of 200 feet doesn't work all that well...
