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This web page 19s18mutazj.blogspot.com states the following, "Thursday, December 16, 2010." We saw that the webpage said " Trilateration in 3 dimensional spaces is very similar in concept, except you are dealing with spheres instead of circles." It also said " If you know your distance from 3 satellites, it would give you two points where all three spheres intersect. The earth itself creates the fourth sphere and thus determines the location of the receiver. Receivers generally look for four or more satellites to improve accuracy and provide precise altitude information. Another application recently developed is."