Finally Reason!!!
just to add nav fix displacement is important only in the planning stage the mileage is given on the charts, or using a plotter so that fuel can be determined...local winds vary anyway so the planning device flight computer, dispatch,..and so on is always trumped by actual conditions...i.e what the GPS or your clock and eyes, if done by DR, tells you, it is as referenced from over the ground...so you don't run out of fuel and crash....I just wanted that part clear.... as looking at this thread I now see that such a statement is open to serious interpretation
...Elmer Sperry must by gyrating
