That HF sonar would have active intercept for it, otherwise the emitting platform wouldn't be able to see its own images (think about it for a sec. You can also hear dipping sonars (~10k Hz) and torpedoes (~20k Hz)). The reason it wasn't counter-detectable in SC and DW is how it was modeled in game. It wasn't actually modeled as a sonar in game, it was just looking at the 3D world with a different "filter" so to speak.
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