Well the mast height method is discussed and very detailed in my opinion. Now for the second question I was eager to read something about the method of counting propellers and to determine the speed of a ship. Unfortunately the author just mentions it and does not give any detail that we can use here. I do believe that this is still a classified information taught at Sub school and "loose lips sink our ships" is the policy over there. From Chapter 6 to the end is all about sub construction and some history on cold war events. I did enjoy the book in a whole and I think it did give me some new perspective on how sub warfare got evolved. Now, it is not a book that actually teaches us in plain English on how to sink a ship with a Mark 14 or a Mark 48 Torpedo but the history of the problems the submariners had to deal with and improvise on the fly to sink ships is a good reason to read it. I do dream of a virtual submariner here on subsim that will someday "release the kraken" and teach us what is taught in sub schools to deal with TMA and sink our enemies. As long as this person does not get arrested.
