Angle On The Bow is a simple question of what HE can see. It is the angle he would see you at if he was looking at you. All you have to do is imagine you're him. Your heading and the bearing you see him at have nothing to do with it.
Here's a set of pictures that will help you get it right every time:
http://www.subsim.com/radioroom/down...o=file&id=3467