Fish it really does all depend on the acoustic conditions. I've come shallow and got TIW's very close aboard.
It seems that the calls are somehow based on detection thresholds now, so if you lower the threshold you will delay the TIW until the torpedo is closer.
The fact that the layer has ANY effect at all now on torpedo detection and TIW calls is enough to cause us to reevaluate tactics in this light, given that previously it was more or less absent as an effect from the game.
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