I use the MILS method as opposed to the mast hight method. Much quicker and easier. It gives you the range instantaneously.
There is a sound trainer for SH3 where you can determine speed by the hydrophone through listening.
I usually use the matching speed method, which is easiest if you have favorable conditions.
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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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