[Pisces]

This method doesn't work if the lines are all overlapping or narrowly parallel to each other. They need at least some separation. So trailing that target won't do you much good. You need to make a course change anyway at some point. (When you are exactly behind it then you already know where it is going. Yuo follow. You just don't know the distance.)

To get best accuracy you want large changes in bearing directions. This is best done by moving to an angle of the bearing with significant speed. And if you are moving opposite to the target in question then those bearing changes are the quickest. But you'll also get behind it fast, and might loose sight of it. Though hydrophone is longer distance than visual bearings, those hydrophone bearings are also far less accurate. The method does not change.