Just as another comment, my grandfather a pilot of 28 war missions and postwar navigation instructor was astounded to discover that I used his "whizzy wheel" 50 years later. He could not believe that we still used out dated dead reckoning in this day and age and at 82 odd years of age thinks the GPS is one of the best navigation tools going.
This from a man who has more hours in the air than I will ever hope to achieve.