hmm ive been thinking about this, I think it may be that most of the time, subs are on their way somewhere. Either to their mission or back to port.
Now whilst they are doing this they wont be going at 4 knots. Higher speed means sonar washout. And the towed array most likely would be stowed.
Whilst your at your position/ mission grid, whatever, it makes sense to go slow with the TA, for maximun Situational Awareness.
Obviously all the above is conjecture on my part. If anyone can shed more light on this please do so .
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