A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: John D. Howard
Date: 2019 Jan 15, 08:11 -0800
In the early 1970s I joined the US Air Force to prevent me being drafted into the Army. As part of the intro physical the eye Doc said I was red-green color dificent. After about a year as an enlisted airman a friend at the Flight Medicne clinic said a new color test was being used - a Farnsworth Lantern test. Shine a light in your face and you say what color. I passed ( just ) and became a pilot.
For the rest of my flying career I never passed the normal ( poka dot ) test, in fact the FarLan test was only in use for a few years. No problem with depth preception, only hard to see the " tan patch of ground near the green trees ...." Luckly for all I flew cargo, not drop bombs.
All the airplanes I flew ( out of training ) had a radar altimiter. What a great tool - flying into a small island over water you had no idea how high you were without it. I can relate to what Frank said about estimating distance on a fractal world.
John H. 41N 100W