At a known distance, any object will appear to have a known length. I think each tick on the periscope is equal to 5 mils, but that is really unimportant. We'll just call each tick on the periscope a unit. The following table is for targets on a perpedicular course and a 0°AoB.
........................Range.............1200m... ........600m
C2 Merchant.............................6units....... ..12units
C3 Merchant.............................7units....... ..14units
I had a chart for all ships and ranges, but I accidently threw it away, and have been procrastinating on redoing it.
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
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