Manual TDC(AoB)

So after watching a manual TDC tutorial on a youtube for SH5 I figured something out and tell me if Im right here on this. To determine AoB all you need is his course, and draw a line. then using a protractor on that course, youd draw from the direction he is heading in, to his bow, then to your bow right?? Lol just a thought but Im glad I can now understand AoB (at least I hope) now I need to get the whole rest of it down