Experts and documents: the US is years from having a reliable alternative source for time and navigation services if GPS signals are interrupted by adversaries (New York Times)

New York Times:
Experts and documents: the US is years from having a reliable alternative source for time and navigation services if GPS signals are interrupted by adversaries  —  GPS has become essential for modern life, but its satellites and signals are vulnerable to attack.  China is years ahead in developing alternatives.

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