I posted a new article on the theory of course deviations.

http://faculty.chicagobooth.edu/john....asp#maccready

or directly

http://faculty.chicagobooth.edu/john...viations_I.pdf

(If the links don't work google john cochrane soaring and you'll find
it under MacCready theory)

I'll try to get some magazine to publish it. Comments and improvements
welcome in the meantime. Yes, the daydreaming about soaring at the
office season has begun

John Cochrane
BB