# 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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