Nearest Tube Augmented Reality App for iPhone 3GS By kurt On July 7, 2009 · 3 Comments A great example of how the addition of a built-in compass has revolutionized the way iPhones are used. Tagged with: 3.0 • 3g • 3gs • Apple • augmented • Augmented Reality • Compass • iPhone • Iphones • ipod • London • reality • station • touch • tube