Once a navigation is under way, the map is topped by a large green bar showing the current step in the directions.

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If you get lost, the "reset map" button will take you back to Beijing's Olympic Green so you can restart your journey.

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To build on a metaphor used by Eric Green, the head of the National Human Genome Research Institute, this is like a map of a coastline drawn by an explorer who has not made landfall.

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