This is the "Range and Aob finder" that you use?
To find the correct placement of the speed scratch mark (I figured that one out for the old OLC mod) allign a length (on the outer wheel) of 100 meters to 100
seconds (on the outside scale of the middle wheel). Then the speed scratch should be just below the 2 (knots) mark on the speed scale (inside scale of the middle wheel) 100 meter per 100 seconds is 1 m/s. 1 m/s = 3600/1852 knots= 1.94 knots-ish.
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