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Originally Posted by neves_rats
I have a question, what are the rulers on the bottom of Albrecht's maps, and where do you get them and how do you use them?
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That is a nomograph (
Here's the guy that made the mod: a nice explanation with 2 links to download it). They are 3 logarithmic scales that make speed/time/distance calculations pretty easy. Just plot a line over it so it crosses the two values you know to get the third.