This shows the Rider Board, with information about the next day's ride, such as distance, elevation gain, and riding directions.  Armed with this information, we'd go to sleep and forget all of it. 

In the deserts of Sudan, there were so few landmarks that we'd literally get directions along the lines of "at 83 km, you'll see a piece of plywood on your left."  Of course, as an American, I'm legally excused from knowing what a kilometer is, so the directions never meant anything to me, anyway.  Look, if you want to use some French, socialist, Brie-eating, capitulate-to-the-Nazis system of weights and measures, go ahead, but if cubits were good enough for Noah, they're good enough for me.