What I do is get a course plot and speed estimate on 'em, then lay out on the nav map a line with the ruler tool along their projected course.
Then use the compass tool to draw a set of radii along the projected course that will keep me far enough away to prevent me being spotted by them, yet still maintain visual contact myself.
Next I'll plot a course for the outer edge of the 1st circle, then plot from there to keep me on the edge of the circles I've drawn. I'll dip inside occasionally to make sure they haven't changed course.
After a while of that, and I'm far enough ahead, I'll draw another circle along their projected course that will put me in a good firing position, manuever into the circle, go to periscope depth and all stop, and wait for them to come to me!
DH
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