[Loadstone] gps accuracy

Monty Lilburn monty at loadstone-gps.com
Sun Oct 29 20:45:16 GMT 2006

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 


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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