Thinking about this a little more, I've got another possibility.
When this edition of the handbook was written (1943), Allied radar technology wasn't well understood by the Germans. Sections 214-216 speak of a direction-finding technology that may be used on the surface, but it's not clearly explained. It may be that the Germans thought it could be an advanced form of ASDIC. The handbook almost seems to be downplaying the danger, and encouraging the commander to stick with the attack. The translators called this ASDIC, perhaps because even they were unaware of radar technology. In either case, it seems that the Kriegsmarine was aware that the Allies were using a technology that was useful for detection and direction finding on the surface.
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