Posted by MarkB_MI on June 27, 2016 at 05:36:34 from (198.208.159.18):
In Reply to: GPS question update posted by notjustair on June 26, 2016 at 19:09:22:
Your "GPS guy" doesn't have an inkling as to how GPS actually works.
Imagine a circle on a map of the earth several thousand miles in diameter. With a single satellite, all your GPS receiver can tell you is that you're somewhere on that circle.
Now imagine two circles intersecting at two points. With two satellites the GPS knows you are at one of those two points.
The GPS needs at least three satellites to fix your position down to a single point. Each additional satellite improves the accuracy of its position fix.
High-end GPS receivers such as those used in agriculture use a variety of techniques to improve their accuracy. If your dealer doesn't understand terms like WAAS, WAD and RTK he doesn't understand the products he sells.
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