Just read the manual - I’m incredibly impressed. The level of detail shows dedicated research on the part of the devs.
For example, we now have the first true-to-life simulation of the German TDC in a subsim- the feature always left out was that the TDC would update AOB for changes in the u-boat’s course. This feature is a game-changer if wanting to use realistic tactics such as shooting while turning (Schuß im Abdrehen), and now we have it.
Also looking at the range chart in the manual I can tell it is based on a Kriegsmarine table I have seen in my own research. Great stuff.
Well well well done here, can’t say it enough!