Finally, the iPhone 3GS digital compass is getting a workout. Software developer acrossair has submitted the first augmented reality application to the Apple AppStore for approval. The app is called Nearest Tube, and will help Londoners plan routes and find the closest underground station. What's unique about this process is how the app delivers information.
Instead of a static map, Nearest Tube displays subway information in real-time, overlaid in 3D on top of live video of the user's surroundings. Holding the iPhone 3GS horizontal will show arrows pointing to different train stops, and tilting the device upwards will overlay signs in the direction of different stops. These signs look like a heads-up-display, and give more information about how far away the station is and what lines connect there.