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This morning I listened to an old podcast about the likelihood and effects of GPS signals getting jammed:
https://www.bbc.co.uk/programmes/p01gsjg7
Quite alarming, but good to hear there is a good backup system in development and that air traffic is not dependant on satelite navigation for its main systems.
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The future of Navigation
The future of Navigation
"People who can breathe underwater when knocked unconscious dont need life jackets"