Please ignore the spreadsheet formulas I posted. They suffer from 2
problems I've always had with pilotage, one being that the zero degree axis
is North (not east, as is commonly used in college math), and the other
being the aircraft vector points in the same direction as the movement of
the aircraft but the wind direction is given in terms of where the air is
moving *from*, not *to*. Regardless, I blew the calculation.

Rather than redo it, I think Tango4's suggestion of looking at the website
with the wind triangles would be better.

Most humbly embarrassed (because I really should know better!),

-Doug