GPS granularity / accuracy in latest smartphones
I am thinking of building an application to detect which user i'm pointing towards using my smartphone. Imagine that multiple people are present in a big room, all of them with their GPS enabled, and i point my smartphone towards one of them.
I wanted to know what is the accuracy of the current GPS hardware and software in our smartphones like iPhone / android? Is it possible to draw a line in space using the location pointed to by GPS and the direction it shows accurately to within say 1 meter? I know that the accuracy degrades indoors, but how much error do you think there would be in a bar for example?
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