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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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