From the manual:
Quote:
CONVERGENCE ZONE
As mentioned above, sound is bent back upwards by water pressure such that if the water is deep enough (~10,000 ft in the Norwegian Sea) it will ultimately return to the surface. The zone in which these sound waves return to the surface is called a Convergence Zone and can be 40,000-50,000 yards away. A ship listening with sonar in this zone could detect the emitter, even though the range is far beyond the distance the sound could travel along the surface.
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I've also been reading the RSR novel, and at some point the Chicago's XO is talking to the skipper about how a contact may be 2 or 3 "convergence zones" away from their boat.
How exactly would they determine that?
Is there any way in cold waters to tell if you're detecting something from a convergence zone and what the range might be? Is it possible to get 2 or more CZs like it's written in RSR?