Yea, what I usually do when I am setting up to attack is I delete the WP as I get near my final firing position. Then manually make course changes from there. I got into this habit because I sometimes have to reverse to get the range I want and then I avoid the problem. Unfortunately in this last case I wasn't in the set up to attack mode as thought the convoy might be 2k away still so I hadn't deleted my WP yet. What am aggravation. I had attacked this convoy previously and sunk 1 ship. From what I had seen its mostly made up of 2 ton targets. So it was pure luck to stumble across the one I did.
I can just here a real captain telling his crew "Delete the waypoint, back 1/3rd"