Morgans wrote:

"Matt Whiting" wrote


Or use the CSC DUATs automatic router.


Or to get a real visual hands on feel for it...

A globe and a string! g



True, but it isn't as easy as you think trying to get a string to wrap
around a globe in a great circle route. Once the middle of the string
contacts the globe with the ends still in the air, it is hard to wrap it
straight down to your route end points without straying a little off of
the great circle route. I've actually done this before and if the end
points are very far apart, it is easy to be a 50 or more miles off of
great circle in the middle of the route. It is a fun exercise though
to, as you say, get a feel for what a great circle route is.

Matt