I was trying out SOSUS performance using the new sonar model in B1147.21. Here are a couple of tests, one with a Victor I, the other with a Foxtrot, both reasonably noisy targets from the era when SOSUS had excellent performance. Tests were run at a combination of standard depths and speeds using the buttons in the F2 window. Sensors were in the G-I-UK gap. (Because of the shallow layer here, this actually makes 'just over the layer' slightly higher than the 'shallow' depth setting.)
Here's the results I got for a sensor in the 2km deep water east of Iceland, north of the Faroes.
A few items caught my eye.
Ranges are mostly in the area of 140 to 160 miles, which would be great for a sub or ship-mounted sonar, but seems short compared to the ocean-spanning ranges the system was reportedly capable of. (The DB gives it a range of 1000 miles.) If the sensor is placed at shallower 900m depths NNE of Iceland, where no CZs are indicated, detection ranges drop to only 50 to 60 miles.
In most cases, speed and cavitation didn't make a difference in the detection range. A Victor creeping at 5 knots was detected at the same range as a Victor cavitating at a full 22 knots.
Performance against deep targets was generally worst of all, which surprised me. I had expected that the seabed-mounted sensors would do best on deep targets, but they actually do better against targets further away on the other side of the layer. Wouldn't their best detection ranges be against targets which are already down in the deep?
Thanks for looking at this and posting such a great consolidated visual of the data you collected.