Obi Wan
As I said to Genghis, I would be impressed with anyone who can use the reverse side of their wizzy wheel on the fly without any practice or refresher. I don't think it is simple in practice (even if simple in principle): I think it is awkward, especially after decades of using software for those tasks. Hence it was very helpful for me to check my results using software, since apart from the flying component, I was being "judged on accuracy of planning" etc...
I should have explained that in my earlier post...