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There are multiple GNSS platforms - not just GPS & Galileo, but also GLONASS, Compass, IRNSS, and others. Some receivers are multi-system capable, such as: http://www.u-blox.com/en/gps-chips/stand-alone-gps-chips/ubx...

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And the iPhone, Samsung Galaxy and others, at least assisted GPS + GLONASS http://en.wikipedia.org/wiki/GLONASS#Receivers

Given that 4 satellites are necessary for a fix, are such receivers able to mix-and-match satellites, say, three GPS satellites and one GLONASS satellite?

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