To be at true silent speed you need to manually adjust your speed to 1 knot. If you leave your speed at the default of 2 when you hit silent speed you're still moderately detectable to surface ships. Many times I've told the navigator to return to course after manually maneuvering away and out of range of the DD's only to have the CE screw up and gun the boat to full speed. Even if I catch the mistake instantly, running the engines up to 2 knots for just a few seconds can be enough for them to get a good fix on you and start circling you again.
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