Re: GPS Accuracy


"Alan White" <alan.lesley@xxxxxxxxxxxxx> wrote in message
news:gshbk3hol5bole5rq6951j7pv989bouijp@xxxxxxxxxx
On Thu, 22 Nov 2007 15:57:23 +0000, Alan White
<alan.lesley@xxxxxxxxxxxxx> wrote:

Fifteen metres r.m.s for 95% of the time over a thirty day period.

You do not mean r.m.s then. You mean better than 15 m 95% of the time over
30 days. "r.m.s." is a different error statistic than 95% of the time (for
2D it corresponds to about 63%).

By the way, the spec of 15 m 95% of the time over 30 days, being a spec, is
pessimistic. The accuracy will generally be significantly better.

Regarding the origninal posters post--it sounds like to me that he may have
a communication problem with the GPS or some other problem.


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