Theres alot more sounds comming from a ship than the screw churning in the water.
Bilge pumps, generators, even ventilation equipment. A ship doesent have to be moving to make noise.
Closing is a relative since this is a simulation if you are drifting and 1/4th of a knot towards your target it will be considered closing.
What I really wonder about is why do life rafts show up on sonar ? You cant 'hear' them.... Ive tried yet they will show up on the map.
Also whats with the "ship spotted" when a sinking ship or for that matter crashing airplane pops a 'survivor'.
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