According to this article they have taken that into account: http://www.readwriteweb.com/archives/color_ceo_the_tech_justifies_the_41_million.php http://www.re

According to this article they have taken that into account: http://www.readwriteweb.com/archives/color_ceo_the_tech_justifies_the_41_million.php http://www.readwriteweb.com/archives/color_ceo_the_tech_just... This leaves an obvious question - why not use GPS? This is where the tech we've been talking about comes in. "Lots of people are trying to create location-based services and using GPS," said Nguyen. "The problem with GPS is that it doesn't work." Doesn't quite say if they are 100% GPS free, but apparently they have identified the same limitations as the article describes.