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A comment on IPhone 4S has GLONASS in addition to GPS. Parent comment

Re:IPhone 4S has GLONASS in addition to GPS by jrockway on Wednesday October 19, 2011 @07:15PM (#3132572)
You need a receiver in the phone that can phase track, which costs 50x as much as the simple GPS chip they fit.

So, $0.50 instead of $0.01? :)

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Re:IPhone 4S has GLONASS in addition to GPS by nobody314159 on Thursday October 20, 2011 @02:18PM (#3136095)
I think Phase tracking GPS chipsets are still pricey - outside surveying applicatiosn there isn't much demand.
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