Interesting, thanks.
What do you make of this:
Quote:
GPS III also will provide a new civilian signal compatible with other countries' navigation satellites, such as the European Union's Galileo system. That means civilian receivers capable of receiving the new signal will have more satellites to lock in on, improving accuracy.
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I've never really understood the differences between the various systems. I just assumed you'd need different receivers for each, although I know some can get a fix from more than one system.