Comment on GPS vs. Glonass vs. GalileoComments−tdeck3yIf 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%29https://en.wikipedia.org/wiki/LORANhttps://en.wikipedia.org/wiki/Loran-C#e_LORANhttps://en.wikipedia.org/wiki/Hyperbolic_navigation
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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/LORAN
https://en.wikipedia.org/wiki/Loran-C#e_LORAN
https://en.wikipedia.org/wiki/Hyperbolic_navigation