From:"Garnet ,K" <gk@whidbey.com>Organization:Whidbey Internet ServicesDate:13 Oct 95 01:30:21References:1 2 3

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This is somewhat tricky in that one must be careful of the brackets. Here goes. D=60*arccos((sin lat1 x sin lat2)+(cos lat1 x cos lat2)x cos(long2-long1)) Initial Heading=Arccos(sin lat2-sin lat1 x cos(D/60) / sin (D/60) x cos lat1) where D=distance from above calculation. If you use Excell I can e-mail you a spreadsheet which does this chore. Garnet.K email= gk@widbey.com