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If you need a great circle solution I cannot add to the advice to take a
look at Mr. Williams Aviation formulary as mentioned in Dan Allen's
response. However, if  you would like a ellipsoidal solution and want to
roll your own in VB6 I can offer my Open Source software which contains,
among other functions, Vincenty's Direct solution which i believe solves
your problem.

If you are interested in having a look at the code, please send me an e-mail
with the word GEODESY in the subject line and I will return to you a 24kB
zip file with every thing you need to build an app to solve your problem. I
will put your name in my distribution list for updates if you wish. Let me
know on this.

HTH

Vic
________________________________________________________

Victor Fraenckel - The Windman                 vfraenc1@nycap.rr.com
KC2GUI                                                      www.windsway.com

      Home of the WindReader Electronic Theodolite
                               Read the WIND

"Victory at all costs, victory in spite of all terror, victory however long
and hard the road may be; for without victory there is no survival."
- Winston [Leonard Spencer] Churchill (1874 - 1965)

Dost thou not know, my son, with how little wisdom the world is governed?
-Count Oxenstierna (ca 1620)

----- Original Message -----
From: "Michael Wescott" 
To: 
Sent: Wednesday, August 21, 2002 2:42 PM
Subject: Re: query


| Mitch B Burrill writes:
| > If I am at lat1, long1,  and go XXX nm at TC YYY, What is the exact
| > formula from spherical trigonometry to get lat2, long2 ?
|
| I would argue that the problem is not sufficiently well specified.
|
| Is TC=YYY merely the initial course for a Great Circle trip during
| which the course will generally vary as the trip progresses. Or is TC
| to remain constant for the whole trip, i.e. a rhumb line course? Or
| something else altogether?
|
| --
|         Mike Wescott
|         Wescott_Mike@EMC.COM
|

   

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