[aprssig] gps accuracy?

Jack Cavanagh cjcav at cox.net
Mon Nov 23 14:07:35 EST 2009

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.
I don't know how long it has been since Dave, AC4IU, updated his GPS 
accuracy pages but it still has both general and detail information
on this topic.

As to your question Wes, Dave's answer is a very ambiguous "it depends".

Jack, KB4XF

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