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Originally Posted by el_Salmon
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lumat83 is talking about Hydrophones, NOT Sonar. Hydrophones are a PASSIVE device, Sonar is an ACTIVE device.
In simple terms
Hydrophone - very sensitive mike
Sonar - Very directional speaker (beam)
You listen with a Hydrophone to any noise source.
You "Ping" a target with sonar to get a return "Pong" on the Hydrophone to determine the range.
A Hydrophone does NOT make a sound beam, Sonar does.
Hydrophones can be inhibited by your own prop wash and your hull (depends where the hydrophones are mounted), also in RL by land mass. However land mass is not modeled in as an inhibiting factor in SH3.