The old fashion way. Read a map.I know,it is tough in the desert.
On a week long backpacking trip I assigned the navivation job to a soon to be Eagle scout and aspiring Army officer. When I was bugged with “how much further Mr Bert?” I told them to ask Tim.
Years later, he wrote me thanking me for teaching him about maps and navigation. As a second LT, he was ordered to check out a trackless desert with no landmarks and miles and miles of literally mothing. He had a map, a compass and a watch to navigate by calculation and dead rekioning.
Later, he was given a verly GPS device