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[aprssig] gps accuracy?

Jack Cavanagh cjcav at cox.net
Mon Nov 23 19:07:35 UTC 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.
http://users.erols.com/dlwilson/gps.htm

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

Jack, KB4XF




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