Real life yes, not in the game. I think they only go active when you fall in the sonar cone, like a auto switch, like it's alway on within the cone. Course, that's the question, what are they doing otherwise, I assume listening, but that's the question, if they can hear when at speed, does their speed effect hearing? Just heard so many times in the past they can only hear stationary, just hard to believe that, the game doesn't act that way, so I assume they have good ears at high speed just like our subs.
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