IIRC (I don't use it anymore) it shows your potential for detection, not whether you have been detected or not. *All it takes is it to go red for a fraction of a second and they might hear *you. *You may not have even seen it flip. *They might have immediately lost you, but they now know your general direction and will respond accordingly.
Your best bet is to practice good discipline and not rely on a meter. *Always assume they can detect you. Approach and withdraw as quietly as possible. *If your at range,k then you may get away with 1/3 speed or so, but if they're going to be jumping you, then manually clicking the speedo till you get below 100rpm (about 1 knot) is better than going just silent running, but you still need to do that.
I only use flank when they can't heear me (no ASW assets around), or if they know where I am and I have to manuever to go deep or avoid DC's. *
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Luck is a residue of Design.
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