GPS website

Does anybody know of a website that can tell you when the best GPS satellite
reception will be at a given location?

On Mon, 04 Jun 2007 16:12:33 GMT, "Donkey Jazz"

This is not needed and hasn't been since the constellation was
completed. In open country, as far as I am aware there are no
preferrred times; you will always have enough satellites above the
horizon and sufficiently widely spaced for a good fix. This is a
historic problem dating back to the days before the constellation was
complete, but it simply isn't a problem these days.

Of course, local conditions may cause you problems due to obscuring
part of the sky or interference, but no web-site could give you these
details.

Paul

You can use the Trimble Planning Software (
http://www.trimble.com/planningsoftware_ts.asp
) . It's free and it can give you constellation details as well as DOP
at any time. it is used to plan the best time for survey so that the
errors are minimal and visibility maximum.

-Ujaval
http://spatialthoughts.com

Actually I was surprised to find this wasn't so just recently. In Feb of
this year we were working in Newfoundland, Canada and frequently had only 4
satellites in view above a 10° mask angle. Lowering the mask gave a better
but noisier result. We had a fix, but certainly not a good one. I'm
guessing that there were one or more satellites removed from service for
some reason, because this really is rare nowadays.

cheers

Marc Pelletier

On Tue, 05 Jun 2007 15:17:15 -0000, Marc Pelletier


I'm surprised too - we work in Antarctica, and for the last few years
we haven't even bothered checking satellite ephemera; we always get a
post-processed result better than a centimetre anyway useing
auto-Gypsy.

Paul