i have a question, does the 16km also allow ships to spot u-boats at 16km? i read somewhere that the average spotting distance for a ship spotting a u-boat was actually only a few miles. i can believe this since we have huge houses on hills around where i live and when you are 5 miles away from them they are invisible or just a dot even with a 50 power binoculars. but there are no waves between me and those house. most ships are spotted at such distances not by their bulk but by their smoke. since u-boats made little smoke i doubt - with their paint schemes - that they could be spotted at great distance.
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