[Rockin Robbins]

Originally Posted by ETR3(SS)

A little bit about sonar on a fleet boat.
https://maritime.org/doc/fleetsub/sonar/chap1.htm#1A

Sure shows how far from reality our game is. Imagine having all those goodies to play with in the game. Of course that implies more realistic sound environment as well or the sonar goodies are useless.

For those implying that sonic (JP) sonar might not exist on later boats, JP sonar remained on all boats through the end of the war.