----------------------------Original message---------------------------- I admit my brain hurts, but I have a simple problem, and I cannot locate a reference which satisfies me. I have points 1 and 2 specified in lat/long. What is my heading if I wish to travel from point 1 to point2? I've been told that it's simple trig, but I don't think so. Can anyone post the proper equations? Regards, Charles Gilley AEL/Cross Systems