That's absolutely perfect! Thanks.
As a CPL student I had all kinds of lines, angles and god knows what else for track errors.
I want to keep it simple for my PPL's and tried this a few times with success. I was after understanding it better so I can teach it with a full understanding! Thanks!
I teach the Standard Closing Angle technique to my students and I find it to be by far the easiest for them to use. Closing angles of more than 30 degrees are not desirable, so at most spamcan speeds it is better to use half the angle and double the time. I have a PowerPoint briefing on the subject - pm me if you want a copy.