OK, just got through with a couple of days of going back and forth up to Grey Beard's 'Hood' for medical stuff. Its early AM now and getting ready to head out to the field (two days without flying) so let me collect my thoughts on how to answer while flying and will get back later this afternoon.

And yes there are some very simple methods while maybe not as scientific or as accurate as the graphic/computer methods it has been working for modelers/experimenters since the 'beginnings'

John