I'm not sure if the scale shown in GWX 3 is a proper centiradian scale. It might indeed require a certain conversion factor. You can reverse engineer that though. Meet up with a friendly ship at the beginning of your patrol. Identify it to look up mast/funnel height or whatever. Have your officer be on the bridge and ask him for a distance to nearest contact. This should be a pretty reliable range. Then simply look in the scope and measure the height. Then do the calculation in reverse. And get the conversion factor for both low and high zoom levels.
Mastheight_meters * conversion_factor / height_in_scope = range_meters
conversion_factor= range_meters * height_in_scope / Mastheight_meters
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