If you're interested in this, you might be interested in the terrestrial radio navigation systems that predated GPS: https://en.wikipedia.org/wiki/Omega_%28nav

If you're interested in this, you might be interested in the terrestrial radio navigation systems that predated GPS: https://en.wikipedia.org/wiki/Omega_%28navigation_system%29 https://en.wikipedia.org/wiki/Omega_%28navigation_system%29 https://en.wikipedia.org/wiki/LORAN https://en.wikipedia.org/wiki/LORAN https://en.wikipedia.org/wiki/Loran-C#e_LORAN https://en.wikipedia.org/wiki/Loran-C#e_LORAN https://en.wikipedia.org/wiki/Hyperbolic_navigation https://en.wikipedia.org/wiki/Hyperbolic_navigation