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Better link that describes the other concerns about GPS that were brought up and describes in more detail how the system works: http://www.defenseone.com/techno

• cfcef 11y ago
  > The testing of a GPS-free version of JPADS is yet another example of efforts to develop alternatives to satellite guidance. “GPS is very expensive to launch and operate,” Defense Secretary Ash Carter said during an April 24 podcast from Silicon Valley, according to National Defense magazine. The global positioning system, he said, “makes us vulnerable to attacks, it is impossible to use in the valleys of Afghanistan or in a big city [where signals are blocked], or in places where the signal is poor.” “At DoD, we worry about enemies jamming GPS signals.” Army Maj. Christopher Brown, who helps run the service’s efforts in position, navigation and timing, or PNT, told C4ISR & Networks last year. “Threats to military GPS have evolved and improved at a rapid pace — from a proliferation of small-scale commercial jamming devices that can readily be purchased on eBay to large-scale military anti-access/area-denial (A2/AD) capabilities.” So the real benefits here are: works in mountains, and future-proofs against better GPS jamming.
  • haroldp 11y ago
    Iran managed to "hack" GPS to steer a state of the art American drone to land safely at a location of their choice over four years ago. https://en.wikipedia.org/wiki/Iran%E2%80%93U.S._RQ-170_incident https://en.wikipedia.org/wiki/Iran%E2%80%93U.S._RQ-170_incid... I would say that GPS's vulnerability is a current problem rather than a future one.