So if our GPS can be jammed, what about the Russian system?
[A harder-to-block alternative to satellite-based navigation is ground-based transmitters, which can be broadcast at much higher power, and more powerful systems can be harder — if not impossible — to jam or spoof.
The importance of having backups to GPS was recognised in the U.S. and senator Ted Cruz sponsored a National Timing Resilience and Security Act in 2017. The act, had it become law, would have required the “establishment, sustainment, and operation of a land-based, resilient, and reliable alternative timing system to Global Positioning System (GPS) satellites… for military and civilian users if GPS timing signals are corrupted or otherwise unavailable”.]
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