@ armistead I like the 60° to 70° approach as it puts me in a good position relative to the escorts and a low profile as well. The flanking DD is most often far enough behind to give me a clear shot and not be on my tail too quickly.
That's why I don't use the O'Kane method, only vector analysis.
A 65° approach will give you a shooting bearing equal to the targets speed. You can adjust up or down 1 degree for 70 or 60° approaches.
My goal is to hit at least 2 merchants and get the heck out of there before the escorts can find me, I have a great dislike for depth charges.
On a recent patrol I racked up 74,000 tons, most with vector shots and only had one DC dropped near my sub. Strange thing was that all this happened within a 40 mile circle and in a day and a half. I had just reached my patrol area and had to hang out for 2 days with no torpedos to complete my mission. I've never seen so many ships in so short a time.
@ I'm goin' Down I haven't tried easy AoB yet but will do so soon as you and others seem to have great luck with it.
Magic
Edit Here is the map of that patrol:
Magic