http://www.itpro.co.uk/616924/google-add...7270fa45bf9092b

"Google said its new Google Maps Navigation product will provide real-time, turn-by-turn directions directly within cell phones that are based on the new version of its Android software."

"He would not comment on whether Apple's iPhone, which offers Google mapping software as part of its standard menu of built-in applications, would offer the new navigation features. He said, in response to a question, that the latest version of the iPhone, the iPhone 3GS, has the horsepower to support the navigation product."
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