You might want to check this one out as well.
http://web.archive.org/web/200710170...man.net/SHIII/
I learned to plot & shoot mostly based on that tutorial, with good results.
The one thing i disagree with on that tutorial, is the way of obtaining AOB when not at 90º perpendicular (explained after the "fast 90" section on the tutorial), there is a far easier way. But other than that, i got great results from reading it.