April 11 - 3:05pm EDT   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. [full story]