During his 45th Infantry Division, Pense taught field wiring, instructing G.I.s on setting poles and stringing wires to rig together a communications network from scratch. After the war, he was an electronics engineer in the private sector, sometimes on military contracts, learning the frailty of the nation’s power grid firsthand. On one government contract, he witnessed a nuclear warhead knock out power in Hawaii after detonating high above the Pacific.
What’s the bare minimum you need to navigate across land? For most people, that would be a compass and map. A basic road map is sufficient to get a rough approximation of the lay of the land. More detailed relief maps can help plan for elevation and estimate possible water sources but they also take up more room in your pack. Waterproofed or laminated maps are also extremely helpful. Lensatic compasses are the most reliable for little money. If possible, a compass and protractor are also extremely helpful for route planning. Obviously, not as essential but nonetheless useful.