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GPS Accuracy?
This is a bit off topic, so if there is some reading I could do to learn more, please point me to it.
I went out today for my first experience with geocaching. BCN worked well, limited only by the notoriously miserable GPS receiver on my Archos 5.
I noticed that as I zoomed in to <0.1 mi. on the bar, my position jumped around a lot.
I found myself turning the GPS off, then on again, repeatedly, to try to bracket the target cache.
Is there a way to estimate the position error, based on the number of satellite fixes and signal strength? If there is, it would be useful to display it somehow in the bcn program.
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There is an accuracy variable that I can query the location provider.
I don't know yet how accurate the accuracy of the accuracy is, or how often it is provided yet, but it is worth trying.
Thanks for looking into that, Nathan.
I have done a bit of reading, it's complicated, all right:
http://users.erols.com/dlwilson/gpsavg.htm
If you think it could be useful, maybe the error bar (or circle) could be optionally displayed on the map screen.
- Jeff
There is a program on the Android Market called "GPS Averaging". It has a Google Group:
http://groups.google.com/group/gps-averaging-app?msg=subscribe
I used it just now to pinpoint my current location (at home, in bed :-)
and after 340 measurements, which took maybe five minutes, it moved me about 10m.
Precise positioning is essential when placing or hunting geocaches.
But it's not easy to copy and paste the averaged coordinates from the averaging program back into BCN.
Maybe you could somehow incorporate an averaging function into BCN? Discuss with Destil David Vàvra?
- Jeff