How accurate are GPS's
Submitted: Sunday, May 29, 2011 at 21:46
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Bravo Man
We have just come back from Popell Corner in the
Simpson Desert and while there we decided to
check our GPS's against the reading at the corner marker.From memory it is supposed to be something like 26 deg 00 00 south and 138 deg 00 00 east but when checking our GPS's 2 of us were only 2 mts apart but unfortunatly we were 200 mts away from the corner marker while another friend was 100mts off in another direction while another was somewhere else but not near the corner marker.
I also rcently bought a GME PLB locating beaconwith a built in GPS and in the instructions it says it will give location to within 100 mts.
I have head people say they are accurate to within a few mts but I am doubting that..
Cheers Peter
Reply By: Bazooka - Monday, May 30, 2011 at 14:46
Monday, May 30, 2011 at 14:46
Peter
If you were at the marker this will partly expalin why your GPS wasn't showing 26S, 138E.
Poeppel Corner - marker V confluence
The comments regarding GPS accuracy have been dealt with by others.
I'm not an expert in PLBs but it is quite likely that a few metres is correct (for terrestrial Australia), depending on where you are on the earth and how many satellites are available to your device.
It's possible that the instructions might be reprints of the old days of Selective Availability, which the USA turned off about a decade ago. This (SA) basically made 'standard GPS' less accurate than it could have been - on average +-100m. Or it could simply be that the company/instructions are being conservative with the accuracy.
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