Quote:
Originally Posted by SoYank
I think you need a minimum of three to get a location; four to get altitude.
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I always wondered about this, so I took the opportunity to look it up and find the answer. As it turns out, you are correct:
"A GPS needs to receive signals from at least three satellites before it can calculate your position in two dimensions, and at least four satellites before it can calculate your position in three dimensions (ie including your height/altitude as well as your latitude and longitude)."