Rodney Myrvaagnes wrote:

On Thu, 26 Aug 2004 17:47:12 GMT, "Arty Facting"
wrote:


Hi

I don't know if you know so I'll mention it anyway

Most GPS units have a measurement accuracy or inaccuracy.

It would be fine if it was consistent day-in & day-out, but it is not

It varies with signal and satellite availability and also with weather
conditions.

The reason I mention this is because you may return to bang the same co-ords
as on the GPS and be up to 30 yards from what you wanted to find. That
being said & writ GPS units are mega-phun!


Before WAAS and while selective availability was in effect, it could
wander as far as 400 feet. However, in recent years I have found about
2 meters to be the practical limit. I check when tied up in the marina
slip occasionally.

There is no way you could come back to the wrong gravestone in an
ordinary cemetary.

The change was made several years ago, and was widely discussed in those
places that discuss such things.

A few feet variation, and not even employing a local point. With one of
those, you can find the same entrance to an anthill...

--
John Mcwilliams