[Loadstone] gps accuracy

Rusty Perez rustys.lists at gmail.com
Tue Oct 31 01:00:24 GMT 2006


But Monty,
if there is this drift asociated with a star III receiver, is it
possible that waypoints which I enter will be very inaccurate? If the
point floats when I'm recording it, then if it floats as I look for
it, doesn't that make it doubly shifted? :-)

Thanks
Rusty


On 10/29/06, Monty Lilburn <monty at loadstone-gps.com> wrote:
>
> Hi Rusty,
>
> I can not comment on the accuracy of the US intersections as I do not know
> the margin of error on those points.  I would imagine they should be
> within 20 metres or so if I were to guess.
>
> Most Serf3 receivers claim accuracy of between 5 and 15 metres 3-5 metres
> if your receiver is using WAAS.  GPS receivers will get you to the
> building, not necessarily to the door!  They usually work very well for
> identifying an intersection, bus stop or train station!
>
> The drift you experience when standing still is normal with the Star 3
> receivers.  Star 2 receivers do not have this drift problem but are not
> nearly as sensative in terms of picking up satellites.  Most people don't
> mind putting up with a bit of drift for the added sensitivity of the Star
> 3.
>
> Monty
>
>
> On Sun, 29 Oct 2006, Rusty Perez wrote:
>
> > Hi folks,
> > I'm new to this, but I'd like to know more about the accuracy of my
> > sirf3 gps receiver--Holux gpslim236, and accuracy of waypoints ETC.
> >
> > The documentation says it should be accurate to 2.5 meters or
> > something like that. What I find is that when I go through an
> > intersection, even in a car, the waypoint that loadstone anounces with
> > this gps receiver is never all that close. If it's ten meters away,
> > that's close. Does this mean that the waypoints which are on the us
> > geological survey are not that accurate, or is my gps really that off?
> > Also, when I'm stationary, even right on top of where I have just
> > placed a waypoint, it seems to wander, sometimes one meter, sometimes
> > 6 or 7 meters.
> >
> > Does this error correction we have in the program really help? How do
> > I know if it's on; there are an on and an off sellection.
> >
> > Should I try and get a sirf2 receiver?
> >
> >
> > Thanks for any enlightenment I will receive.
> >
> > Rusty
> > _______________________________________________
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> > Loadstone at loadstone-gps.com
> > http://www.loadstone-gps.com/mailman/listinfo/loadstone
> >
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