Butch,
When I was a little kid, my dad taught me how to use a slide rule. I had a calculator....one of the first made....but I truly enjoyed using the slide rule. I still have it and once in a while I take it out of the case and work with it.
These fancy aviator watches are used primarily for backup systems in the event of a power failure in the cockpit, but many experimental pilots use them as their primary navigation instruments. In this day and age of computers and fancy global positioning satellites, a good 'ol fashioned mechanical aviator's watch is nothing more than a security blanket in the event that there is a huge EMP event....ElectroMagnetic Pulse that knocks out all of our fancy computer gadgets.
Joel