Why Do GPS Receivers Need to Receive Signals from Four Diffrent Satilites Not Just Three?

Answer

To get coordinates by triangulation in three dimensions would require only three satellites. By using four satellites though it can provides four times more accuracy.
Q&A Related to "Why Do GPS Receivers Need to Receive Signals..."
its confusing.
http://wiki.answers.com/Q/Why_do_gps_receivers_nee...
Three gives you x,y position in 2 dimensions. The 4th gives you altitude allowing your receiver to tell you how much above sea level you are.
http://wiki.answers.com/Q/Why_does_a_gps_receivers...
only 3 converges to 2 totally different solutions: one on earth surface and one thousands of miles up in space. If we are sure we can ignore the one in space safely, then 3 is just
http://wiki.answers.com/Q/Why_do_gps_receivers_nee...
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