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Originally Posted by allanon87
i assumed that the different speed of the sound between sea floor and surface helped me to be more undetectable....so i was wrong.
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Oh ok, you mean curved soundwaves because of soundspeed changes with depth. In reality the sound is curved towards depths with lower soundspeeds. So it is either bend back to the surface, or into the depths if there is a maximum. And both bottom and surface might cause it to reflect. If there is a minimum speed somewhere, then the sound is bobbing up and down around that depth. This is called the deep sound channel. How the sound curves from or towards you is complicated, especially how much of it arrives at the listener. Dr.Sid made a simulation program to illustrate this by ray-tracing. It's called SoPro iirc. There should be a thread about it somewhere over here.
The game simplifies this sound physics allot. On the other side of a layer you are pretty much undetectable. Unless you get within a certain distance from a surface contact, then it is a direct path detection. This distance is dependent on your depth. DrSid did found this out in a series of tests on detection ranges some years ago. Again, do a search.
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but i'm quite sure that near surface (20m depth for expample) an enemy radar can find me, that's right?
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Radar doesn't penetrate water. But sometimes you do if you are too close to the surface, and the waves are bad.