Reply to post: Re: Not quite

Smartphone SatNavs to get centimetre-perfect GNSS receivers in 2018

Steve Todd

Re: Not quite

No, GPS can get away with only 3 satellites for a fix, but can’t give you altitude with just the 3. Four or more are needed for a full 3D fix.

http://www.gpsnuts.com/mygps/gps/technical/ed.htm

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