what happens when the iPhone's battery dies? Do you just go to sleep for the day?
While Apple still isn't officially allowing these apps on the iPhone (via the App Store), this is a pretty cool technology and may actually be the first compelling reason to upgrade to the iPhone 3Gs.
When Apple announced the addition of a compass to the iPhone 3GS, shortsighted onlookers responded with a yawn. Yay, we can find magnetic north.
But iPhone app developers quickly saw an opportunity, and a new breed of "augmented reality" apps are about to be born.
Holding the phone in front of you, locations are plotted on a live view of the world in relation to where you're standing. The apps combine the phone's key features -- camera, GPS, compass and Internet connectivity -- to create a sort of heads-up display reminiscent of first-person shooter video games.
http://latimesblogs.latimes.com/technology/2009/07/augmented-reality-iphone-apps-subway-twitter.html
Two demo videos of these apps follow...
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