Not quite unspoofable, at least once the signal has been received for time-delayed rebroadcasting/meaconing.
But spoofing does become detectable by any receiver with a sufficiently accurate clock (I think for complete protection it would have to be an atomic clock though).
So until the new satellites are deployed and all receivers are replaced (say a decade or so), all civilian GPS could be jammed, shutting down a lot of civilization. Sure the military missiles will hit their targets, but nothing else will work. It would be like trying to fly near Ukraine right now where large holes in GPS appear frequently, but instead happening across the world. There are indeed very large civilian consequences to current GPS vulnerabilities, regardless of what Lockheed says. And many military systems eventually rely on the civilian world for long term support.
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[ 3.1 ms ] story [ 25.7 ms ] threadRecent news: https://www.euspa.europa.eu/newsroom-events/news/galileo-get...
https://en.wikipedia.org/wiki/GPS_signals#Legacy_GPS_signals
https://en.wikipedia.org/wiki/GPS_signals#Modernization_and_...
But spoofing does become detectable by any receiver with a sufficiently accurate clock (I think for complete protection it would have to be an atomic clock though).
https://gpsjam.org/
https://www.flightradar24.com/data/gps-jamming