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Top-level
 @kenshirriff it's astonishing what engineers had to come up with before reliable electronic displays this is an RAF Ground Position Indicator Mk4A, a navigation computer from the 50s/60s, used in transport aircraft and some of the early jet bombers. it takes true heading, groundspeed, and drift angle inputs (the last two from a Doppler radar) and integrates to track the aircraft's movement from a known starting point 3 comments
@kenshirriff I made a simulation of this in X-Plane and the code for the core behaviour of the computer is a few lines of code - and most of that is for the "fix" function, where the inputs update the memory drums instead of the display rollercounters so you can make a correction. when you move the switch back to "normal" the memory drums are driven back to the zero position and they update the display drums as they do so @kenshirriff I should make a proper video about it at some point |
Gregory's Server
@JackEric That's a nice navigation computer!