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How accurate is GPS?	by McNutcase	2009-08-26 16:23:07
General rule of thumb, 5-10m horizontal	by AndyA	2009-08-26 16:53:33
assuming good conditions. As good as 2m if you are lucky. Good conditions is more a function of SV geometry than the number of them. 5 in the correct places, one at each compass point and one overhead, is far better than 10 off to one side. Generally more than 8 isn't going to give you much benefit. If your GPS gives you a PDOP (or HDOP or GDOP) number then double that and you get a ballpark figure for the error in meters assuming a good quality GPS system. Closer to 4 times that number for most consumer GPS systems. Also GPS accuracy is a statistical thing, most of the time people are talking within that distance of truth 68% of the time.
[ Reply ]
OK. That tells me they were actually using DGPS.	by McNutcase	2009-08-26 17:25:24
It could just be WAAS/EGNOS.	by AndyA	2009-08-26 17:43:44
They were getting high accuracy in real time.	by McNutcase	2009-08-26 17:47:44
We have a company saying	by AndyA	2009-08-26 17:57:54
That sounds like a play on "Time is money".	by kahuana	2009-08-26 19:10:37
It used to be that was the only way.	by AndyA	2009-08-26 19:24:28
Oddly enough this happened in the mid 90's.	by kahuana	2009-08-26 19:30:08
More like the this: Good/Quick/Cheap....Pick Two. (n/t)	by retiqlum2	2009-08-26 20:17:55

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