Then you'll be able to see on the map screen display your position relative to each other.

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Visitors are handed a customized Nintendo DS mobile-game unit and led to a screen in the floor made up of 70 large display panels showing a detailed, animated map of Kyoto.

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With its bright display and pinch-and-zoom touch screen, the iPad feels like a "giant interactive map, " Ostrowski says.

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In addition to letting users dedicate different tasks to different screens, Mr Martynov suggested users might want to display important information such as an airline boarding pass or a map on the e-ink screen to take advantage of the fact that the technology only uses power to refresh - and not maintain - its image.

BBC: Yota smartphone