i was going to post this in the e6b thread but there are no reply buttons there.
if u r interested in some computer based e6b functionality, check out this link....
http://www.luizmonteiro.com/ (http://www.luizmonteiro.com/)
click on the red "wind triangle" in the upper middle "most popular sections" part of the page. the actual wind triangle calculations are a bit down the page, and will allow u to fill in what u know and get what u dont know. u should be able to save the wind triangle page to ur puter so it can be used if u do not have access to the net.
obviously, there is also a lot of other information there.
bill