Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: utzoo!watmath!clyde!burl!ulysses!gamma!epsilon!zeta!sabre!petrus!bellcore!decvax!genrad!panda!talcott!harvard!seismo!brl-tgr!ron From: ron@brl-tgr.ARPA (Ron Natalie ) Newsgroups: net.aviation Subject: Re: Wanted: great circle nav programs. Message-ID: <1196@brl-tgr.ARPA> Date: Tue, 3-Sep-85 16:12:28 EDT Article-I.D.: brl-tgr.1196 Posted: Tue Sep 3 16:12:28 1985 Date-Received: Fri, 6-Sep-85 03:45:59 EDT References: <176@midacs.UUCP> Distribution: net Organization: Ballistic Research Lab Lines: 12 > > I now have an oportunity to get some right seat time in a Cessna > Conquest. I was amaised to find out how dumb the expensive RNAV > computer was that is on board. It does'nt do any great circle calculations, > just straight from waypoint to waypoint. > I once wrote a program to aid a friend in the charter business that estimates the air distance betweeen two lat/long pairs. I don't have the program, I loaded it into a TRASH-80 pocket computer which I don't know where it is anymore. If you are going to do this yourself, look up the "Spherical Law of Cosines." It's the heart of all these calculations.