Crab,
That sounds like it might be along the lines of what I had been shown before, and I still have my (dusty) whiz wheel, but I remember that I did the wind correction in the US way (wind up) rather than wind down. In any event, I do fully recognize this as an exercise and I do routinely make my way to vessels via GPS, VMC, and although I don't have a plan to do it, the SAR wicnchman/navigator who initially showed me, said it worked for him IMC within a very reasonable distance. Thanks................I would appreciate a look at it.