[HydroShok]

if you pick surface duct then it can be like 400-1200 roughly.

manual says convergence zone is supposed to be 100-300 but its more like 200-400 for me.

try the CZ. shouldn't go deeper than 450ft.

Canary islands make a good CZ. I did some testing there with some seawolves

both above layer at 4 knots, can hear each other 21 miles away

both below layer at 4 knots, can hear each other at 11 miles away

can't hear each other at all more than 7 miles away under any circumstances, even if the sub above layer is cavitating at 40 knots.

you can get an active return above layer at 21 miles, but the layer seems to block the below layer sub. Seems like they fixed active sonar bug i guess. Layer doesn't stop an active sonobuoy too much however.

rock gives long range, mud=medium, sand=short range sonar. if you pick sand and bottom limited it gives you radically bad sonar conditions. Sonobuoy on active wont even work farther than 1 mile. Mud bottom in a place with 200-600ft of water will limit active buoy to 2.5-3 miles. Otherwise its almost always 6 miles.