> Hopefully it calculates the great circle route which is a curve, not > a > "strait" (sic) line. A great circle route is a straight line (for certain values of straight) on the surface of a spherical projection. But, you knew that :-) Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist