updated 03:05 pm EDT, Fri April 11, 2008
GPS in iPhone 2.0
A MacNN reader has discovered nearly conclusive proof that Apple is implementing GPS support in the next iPhone, with notes on the developer site mentioning altitude measurements - something that is impractical with current cell tower-based positioning due to accuracy. The note says little else regarding the "verticalAccuracy" variable, besides noting that it can be a positive or negative value, measured in meters, and that it is available in iPhone OS 2.0 or later.
The document relates to the "CLLocation Class Reference", and can be found on the Apple Developer Connection website.