How has technology become so pervasive?

May 26, 2011, 09:26 AM

http://www.philiphodgetts.com/2011/05/how-has-tech...

Recently we've started a regular evening walk and, being the kind of guy I am, I wanted to track how far we walked and in what time. Naturally there's an app for that! What struck me though, is that this app tracks position and elevation: a trick that requires tracking four GPS satellites.

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