Be aware though that in SH4 the thermal layer works "a little different" than it does in the real world. It's really just a percentage reduction to AI sonar and that depends on how it is set in the config files. Because the thermal layer is always there in game (WWII submariners only wished it would always be there) I've set mine to the lowest factor without turning it off completely. Still--that 20% can come in handy

. Fire up RFB and make a scenario with just you and 2 Japanese Elite Matsu Escorts in clear weather (0ms winds) and you'll
probably see what I mean. Try it using a pre-Gato Class. I dare ya

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