I don't use on personally, I just park a set square at the trailing edge and work it out from whatever datum the control surface is next to.

Whilst I fully agree that good flying aeroplanes are the results of being well built, I think there is much more to be said for building a straight model than for setting up control throws to the nth degree. There's no science goes into the recommended throws after all, it's just where the test pilot thought it flew "nice" to him.

They are the fully endorsed starting point by anyone on here, but total accuracy isn't really neccessary, and many people will tweak them as they get used to flying the model anyway [8D]