ICBM's also can't use GPS or equivalent navigation satellites, as those will likely be the first to be taken out in a nuclear exchange. They use inertial guidan

ICBM's also can't use GPS or equivalent navigation satellites, as those will likely be the first to be taken out in a nuclear exchange. They use inertial guidance (https://www.thedrive.com/the-war-zone/30254/this-isnt-a-sci-fi-prop-its-a-doomsday-navigator-for-americas-biggest-cold-war-icbm https://www.thedrive.com/the-war-zone/30254/this-isnt-a-sci-... ) maybe together with some star navigation system for mid-course guidance.