The math is harder than the general concept. I had to learn how to do it on the DRT with a special set of dividers.
Later I got to work on an airborne EW system that would do it with radar pulses. I won't mention which system.
WWG1WGA
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)