# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: query
From: Glendon
Date: 2002 Aug 22, 09:06 +1000

```Oh, I forgot, that site also has Vincenty's method in downloadable  Excel
while I haven't looked, the formulae must be embedded in the spreadsheet
cells.

As other posters have noted, Vincenty's method is a bit of overkill in terms
of accuracy required for navigational problems

Lee Martin

----- Original Message -----
From: "Glendon"
To:
Sent: Thursday, August 22, 2002 8:43 AM
Subject: Re: query

> As Vic Fraenckel has noted, Vincenty's formula, direct method, will
provide
> an ellipsoidal solution to your problem. For an online application of
> Vincent's formula and reference to his original article, go to
> http://www.auslig.gov.au/geodesy/datums/vincenty_direct.htm
> ----- Original Message -----
> From: "Mitch B Burrill"
> To:
> Sent: Thursday, August 22, 2002 4:54 AM
> Subject: Re: query
>
>
> > Thanks Michael,
> > It would be constant TC. Sorry, but I only discovered what a rhumb
course
> was a few hours ago.
> > I am rapidly becoming obsessed with navigation !
> >
> > Mitch
> >
> > Mitch Burrill
> > mburrill@leesburgva.org
> >
> >  -----Original Message-----
> > From:   Michael Wescott [mailto:wescott_mike@EMC.COM]
> > Sent:   Wednesday, August 21, 2002 2:43 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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