Before revision: It is distinguished from travel by traditional groups , such as the Tuareg across the Sahara and the Inuit across the Arctic, who use subtle cues to travel across familiar, yet minimally differentiated terrain.
After revision: It is distinguished from travel by soldiers and civilians , such as the Tuareg across the Sahara and the Inuit across the Arctic, who use subtle cues to travel across familiar, yet minimally differentiated terrain.