This sat is replacing an old one, which will be moved but kept operational.
Sounds like the big difference is signal is stronger, well, and there will be one more sat then since hte older one will be moved.
According to the article I read on cnn.com, the signal will not only be stronger, there’ll be a second signal for civilians, like the military has had from the beginning, to correct for interference from the ionosphere. More satellites will have to be deployed to realize the benefit, but I can see a new receiver in our future.
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