That's how ICBMs do it! > Intercontinental ballistic missiles use celestial navigation to check and correct their course (initially set using internal gyroscop

That's how ICBMs do it! > Intercontinental ballistic missiles use celestial navigation to check and correct their course (initially set using internal gyroscopes) while flying outside the Earth's atmosphere. The immunity to jamming signals is the main driver behind this seemingly archaic technique. Source: https://en.wikipedia.org/wiki/Celestial_navigation https://en.wikipedia.org/wiki/Celestial_navigation