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Nearest Tube: An augmented reality app for the iPhone 6 Jul 2009

Nearest Tube uses the iPhone 3GS's video and compass features to point Londoners to their nearest tube station. From acrossair (its manufacturer):

"When you load the app, holding it flat, all 13 lines of the London underground are displayed in coloured arrows. By tilting the phone upwards, you will see the nearest stations: what direction they are in relation to your location, how many kilometres and miles away they are and what tube lines they are on. If you continue to tilt the phone upwards, you will see stations further away, as stacked icons."

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