Numbers 10:31

And he (Moses) said, Leave us not, I pray thee, forasmuch as thou knowest how we are to encamp in the wilderness, and thou mayest be to us instead of eyes. The cloud which went ahead of the army showed only the general direction of the way, whereas Hobab could act as the guide of the people in showing them the best roads and in planning their camps, since he had lived under wilderness conditions all his life and was familiar with the entire country.