Originally Posted by
_Agrajag_
Thanks. Makes sense. I had a feeling there were ways to get range as well as bearing from passive sonar, just didn't know how it was done. Presumably modern signal processing makes that easier and more accurate.
In crude terms, you put a zig zag in your course to form a baseline from which to triangulate the bearing. Do it a few times and you have a last known course and speed - which is why skimmers zigzag in the face of an SM threat.