Wow...that's some amazing clarity given, RR. I had no idea the SH4 sim was so off the mark! I'm somewhat disappointed to learn that the way I hunt has no similarities to reality.
I use sonar while traveling on the surface (at standard speed) to find convoys (I have no SJ yet)... and in this book, Calvert claims they ran on the surface and relied on the high periscope for extra visual range to spot convoys.
I thought I'd pick up some cool tips from reading this book, but now I'm finding this game is becoming less and less a
realistic sim altogether.