I was interested in this OSD that apparently used data from the Naza FC - sounded good, but I really couldn't find much in the way of documentation, so this is my attempt to document it a little more.
This review is kind of the style of I work it out as I go and happen to film it. Having watched it back I wonder if this is the best idea - is it better that I work everything out first and give you just the stuff you need, or is it useful to see me blunder/mutter my way along and show you the problems as they happened ?