IRL, I'm not sure about the KM, but the USN I know thought that it would be a good idea to fire on sound bearings only to avoid ASW measures. So...that's what skippers did at the beginning of the war. They found out quickly it simply wasn't accurate enough, it just didn't work.
I'm fairly sure shooting at sound bearings wasn't done at all historically by the U-Boots FWIW.
PD
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