Comment by flohofwoe

First time I stumbled over Nomograms (or rather 'Nomographs' as they're called there) was a few years ago in the Silent Hunter 5 uboat simulation. It's part of the navigation map tools and used to quickly lookup speed, time or distance from the two other (observed or estimated) values, usually for dead reckoning of surface ship locations. Lot's of other interesting and educational stuff in that game, like a handful of other "mechanical" navigation tools, and a proper Enigma emulation (this is implemented in a mod though).