I was told by Cdre Gibs that:
circle at 12000m = Range of main guns
forward arc (approx 270º) at 4000m = Range of Hydrophones
circle at 3000m = Range of Secondary Guns and/or AAA.
forward arc (approx 160º) at 1500m = Range of ASDIC
Distances and angles are taken from NYGM TW 2.0. The stock angles and distances are different, but the idea is the same.
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