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Hi clive:

I also use "Yallop B. D. and Hohenkerk C. Y. (1995), Compact Data for 
Navigation and Astronomy 1996-2000, HMSO ISBN 011-772467-X", for ephemerides 
and analytic sight reduction. I've developed my own almanac and celestial 
programs for PC, and the results are the same as in NavPac, the software that 
come with CD 1996-2000.
With a standard calculator is very easy to find GHA and Dec, for all the 
bodies used in navigation. And with programming this become precise and 
quick.

Clive, are your equations for Intercept and Azimuth the same as in the least 
squares method on CD?. If not, could you describe these?

OTOH, I've ask the following to HMNAO:
I�m interested in Compact Data for Navigation and Astronomy for 2000 to 2XXX, when will be available?.
and HMNAO have said to me:
"We are hoping to produce another volume of Compact Data and the navPac
software that comes with it."
HM Nautical Almanac Office                              hmnao@nao.rl.ac.uk
Space Science Department                 Web:  http://www.nao.rl.ac.uk/nao




See You!

Andr�s Ruiz
e-mail: aruiz@orona.es
My Navigation page:

http://www.geocities.com/CapeCanaveral/Runway/3568/index.html includes 
information about Compact Data for Navigation and Astronomy





-----Mensaje original-----
De: J.C.Sutherland < jcs@CWCOM.NET>
Para: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM < NAVIGATION-L@LISTSERV.WEBKAHUNA.COM>
Fecha: domingo 22 de agosto de 1999 23:31
Asunto: Re: GPS CRASH


Incidentally I use a Texas Ti-82 calculator, which has a graphics display, for 
Sight Reduction. It has a good statistical proceedure built in. For example, 
I can tabulate a series of repeated sights and then find the least squares 
fit equation, using linear or quadratic regression,and display the derived  
plot on the screen together with the observed sights (so that I can  reject 
any bad sights).
I have written programs for converting these equations into an Intercept and 
Azimuth for plotting a Position Line on a chart.
I use the 5 year " Compact Data for Navigation and Astronomy  by HM Nautical 
Almanac Office" for GHA and Dec etc data. It is cheaper than 5 copies of  the 
1 year Nautical Almanac and takes up less space.However it takes a bit of 
getting used to.

If anyone is interested in these programs I be happy to copy them over. 
However they are specific to the Ti-82,

Regards to everyone, Keep up the good work

Clive

   

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