The easiest and quickest way to find a great circle is to stretch a
piece of thread between the two points on a globe. I "snap" the
thread a couple of times to overcome friction, and of course the
larger the globe, the more accurate the plot.

Or just make a route in a GPS and look at appropriate points at the
edge of a map. You can get a quickie feel by planning a route on
airnav.com

Ron Lee