Aloha - I guess that depends on where the sensor is mounted - the bottom mounted hydrophones are for the most part omni directional - with the operator interpeting strength based on what side is strongest - this phone system would suffer from hull shading from a contact above it but it would also depend on the arrival path of the sound (I.E. Bottom Bounce or multi-path signals) - so in theory there would be no baffles on some cases. The Rotating "JP" antenna was also limited but not by "Baffles". The biggest thing limiting it would be the speed of the ship with water flow over this system. The ships self noise component would be minimal - particularly at 3 knots. Once the boat speed up and started to cavitate then there woud be an area astern that would be Own Ship Self Noise - but since the antenna was trainable and mounted in the Torpedo Room this would probably also not be that bad. Here is a link discussing WWII Submarine Sonar systems.
http://www.fleetsubmarine.com/sonar.html
If the game has "Baffles" then it is not accurate in that regard.