Sure looks like good work there! And based on the real navigational method too!

Regardless of the problem of the time needed to collect the data (which would be a problem for a real WW2 skipper too) I really believe that including it as a "tool" would be beneficial. (Not only limited to hydrophone work).
The method is not post WW2. It is included in the official 1941 US Navy Maneuvering Board Manual.

(under
Case XI I think, which BTW could be a nice name for the method/software if included in the game

...)
.