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Originally Posted by el_Salmon
I think this depends on bearing, because hidrophone has a directional beam.
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The early hydrophones were fixed, but you soon get to purchase the 360 degree rotating improved model (That's the little "T" shaped device on the deck on the front of your boat).
BTW, "Sonar" is a generic term for using sound to detect other ships and submerged contacts while underwater. There is an "Active" variety and a "Passive" one. Active sonar sends out a ping, passive just listens.
S