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Reply to "Article on Comparisons of accuracy of GPS compared to the Counter"

GPS compares the time it takes radio waves to travel from the satellite to the receiver. There are a huge number of factors that will cause fluctuations from one measurement to the next.

Since they are radio waves, they can be reflected off any of a number of objects. Power lines and metal fences can be some distance away and still have an impact. Anything remotely reflective can cause a bad point.

There are many atmospheric factors that will make an impact as well. From density in the troposphere, to solar storms in the ionosphere, air plays a large part.

Civilian GPS isn't supposed to be as accurate as possible. Accuracy is improving as more channels are added, and the network of satellites is upgraded from time-to-time.
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