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Clive:

Many thanks for clearing the question. Trimble has been on the forefront
of all the developments so it is not surprising. The next question will
be is how it handles the Y2K rollover.

The remaining new info is valuable, too. Is there anything new
from HMNAO on data for 2001-2005?

Take care,      Tony

"J.C.Sutherland" wrote:
>
> Tony:
> Thanks for your question. My GPS is a 6 yr old Trimble Ensign.
>
> I have been carefully monitoring the position of my house all day today and
> have had no glitches or problems of any sort. Even when I switched on this
> morning it aquired satellites in 15 min which is a lot faster than when I
> first bought it.
>
> A discussion group on all aspects of satnav I recommend subscribing to is
> the RIN website at  .
>
> 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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