Ah, now I see what you mean. Yes those scales are similar to something I developed long ago, and OLC seems to have corrected and enhanced it considerably. The idea in the original scale was to use 18 metres as reference, (Bridge of large ships, funnel of small ones) and by multiplication with the scale you would get approximate range.
A further evolution of that I did later by using 5.75 degrees (Which is 0.100) as "10" and then half of it is "20", half of "20" is "40" and so on. That way it can be used with any heigth and not just 18 metres.
This allows you to get range by multiplication instead of division, which is usually easier to do menthally (Well at least for me LOL)
EDIT: In fact I added such a scale to the game's binoculars, for my next evolution of Hitman's optics. I based this on picture I found of a real reticle from a watchcrew binocular.
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One day I will return to sea ...
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