IECaomhanach is discussing:

The British authority which is responsible for mapping the oceans is set to dispense with traditional paper charts despite threats to digital.

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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