Geotagging of a Personal ID transaction could have a number of interesting uses. For instance, verifying where the person is at the moment. Properly bound, the ID verification and associated location information data answers the questions, "Who" & "Where". Again, using an iPhone 3Gs as the client terminal, the GPS hardware and magnetometer are already on board.
Be sure to look back in time on this blog for other "its really me" invention information. Keep thinking, "Public Domain".
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