sine alpha = opposite/hypotenuse
alpha being angle subtended on periscope
opposite = mast height
hypotenuse = range
so range = mastheight / sine angle subtended
but the earlier scopes with the split prism had this calculation automated, as the american scopes do in sh4
Hitman fairly recently demonstrated that the telemetry markings on the periscope reticule were in radians rather than degrees, which apparently makes the range calculation easier
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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