Navigation plays a huge part in this race. They are not always on a road, and being able to read your roadbook (navigation notes) is very important. If your cruising down a road and it says turn right at km126.4, you had better turn right at 126.4 even if that means going off the road and straight across a dirt expanse. On this last stage the winner averaged 55.xx MPH, thats FAST over 175 miles.
Roadbook for a bike. Its electrically activated, there is a switch on the bars to roll it forward. You have to keep an eye on your odo vs the roadbook. No GPS is allowed in the Dakar, other than as a heading. No arrow to waypoint etc.