[GeoStL] Re: Perfection is hard to achieve
- From: "Jim Bensman" <junkmailno@xxxxxxxxxxx>
- To: <geocaching@xxxxxxxxxxxxx>
- Date: Thu, 3 May 2007 12:18:59 -0500
-
I hope I explain this right but bottom line is it makes your reading
significantly more accurate. The GPS calculates your position based on how
far you are from the satellite. The GPS figures the signal travels at the
speed of light. But the signal does not travel quite that fast.
Atmospheric conditions will slow it down. So the GPS will be off. They
have a way to tell how much it is off at a particular time. So they beam
that information to the WAAS satellites. The WAAS satellites then send info
to your GPS on how to correct for the error of the signal not traveling at
the speed of light. In the Garmin's the bars will have a D above them when
they have a WAAS fix. If I remember correctly you will generally have 10-15
feet accuracy when you have a WAAS fix. I also do not think this is taken
into account with the GPS's estimate of accuracy.
Jim Bensman
"Nature Bats Last"
> -----Original Message-----
> From: geocaching-bounce@xxxxxxxxxxxxx [mailto:geocaching-
> bounce@xxxxxxxxxxxxx] On Behalf Of Stephen Martin
> Sent: Wednesday, May 02, 2007 8:15 PM
> To: geocaching@xxxxxxxxxxxxx
> Subject: [GeoStL] Re: Perfection is hard to achieve
>
> -
>
>
> >When taking coordinates is not having a WAAS fix the best way to go?
> Is not
> >that better than averaging the waypoint?
>
> What is a WAAS fix?
>
>
>
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