It depends on what boat you're driving as to what your "silent" speed should be. In a Seawolf or Virginia, you should be doing 5-7 knots, there's no need to go as slow as 3. But in a 688(i), I would recommend 3 knots.
In a Kilo, probably 3 or 4 knots but in a Lada or a Type 212, 5-7 knots as well.
This all assumes Reinforce Alert mod.
Lanzfeld, it depends on the towed array. Its performance stays pretty constant until you get close to washout speed. For the Akula, if my memory serves, they washout around 12 knots I think. American boats have the TB-16 and the TB-23 or TB-29. The TB-16 is a higher speed towed that works up to somewhere between standard and full, but has lower sensitivity. The TB-23/TB-29 work to lower speeds, more like between 2/3 and Standard, but have increased sensitivity.
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