With fear of being wrong but I assume they are talking about the quick reference card that cross links mast height, tick marks on the UZO and distance to target. (Been ages since I used those but IIRC you ID the ship, look up the mast height, then read off the UZO the number of "ticks". Look at the table a find the column for nearest mast height, find the row with the nearest number of tick marks and you get an approximate distance to target.)
As for the formula: I use MaGui WS but assuming they have the same magnification, I use mast/tan(ticks/7.5) = distance which seems to give me a good enough distance. Could be you should use 7 as a factor but 7.5 works for me.
If you have the red night attack scale too, that one is (from the upper solid line counting down), scale value x 10 x mast height = distance.
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