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Drivers and co-drivers are often going for each others' throats. Left, right, straight ahead? Or is the map upside down? In the Dakar Rally, arguments and mistakes simply aren't allowed to happen. Those who aim to win this race, the toughest in the world of motor sport, are advised to get to know the terrain and route inside out. The co-pilot and navigator is for the speed and success of the team just as important as the pilot.

http://www.nicovideo.jp/watch/sm9487582