Earlier quoted context omitted.
Seems unlikely to me: there are many nomadic tribes, but this linguistic particularity and these abilities in spatial orientation were only reported for this tribe (AFAIK).
According to the professor on whose research this information is based, a third of the world's languages have this linguistic peculiarity. You can hear her account around 30 minute mark of this RadioLab episode: http://www.radiolab.org/2011/jan/25/birds-eye-view/
http://online.wsj.com/article/SB1000142405274870346730457538...
suggests that speakers of all these languages share the good spatial orientation abilities. Anyway it's true then that my argument doesn't hold. One should first verify if there is a subset of nomadic peoples that lack this language feature, and that they have poorer orientation abilities.