[aprssig] gps accuracy?

Patrick winston at winston1.net
Mon Nov 23 08:11:55 EST 2009

Depends on the gps and its manufacturer..  With some manufacturer (ie 
garmin) accuracy is up to double what the unit says it is.


Wes Johnston, AI4PX wrote:
> Can anyone say what the accuracy of the GPS system is for a civillian 
> grade CA receiver outside the USA?  With WAAS enabled, my garmin 
> "told" me it's accuracy was 11 feet (3.35m).  I had occasion to test 
> it against three known points and it was actually off the mark by 16 
> to 21 feet (4.8 to 6.4m).  Never the less, it got me thinking about 
> the 1990's when selective availability was on and I wonder if SA is on 
> outside the USA.... particularly in the middle east.
> -- 
> Wes
> ---
> God help those who do not help themselves.
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