Fred, someone on this forum once posted a link to a web site that had the developmental stages of ASDIC illustrated. It showed the listening cones of its corrosponding development in relationship to the ship's bearing. IIRC the cone started out very narrow covering approxiately 10-20 degrees on both bows (340-20+or - a few degrees on either bow.) As the years progressed that cone began to widen, until, and again IIRC, it was able to cover the ship from beam to beam. It could have been even more but this post was made awhile ago. Possibly even before SH2. The years you describe make me think the cone was still a tad on the narrow side.
Then again, didn't the allies develop a rotating sound head by the end of hostilities?
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