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    Re: U.S. Naval Academy Reinstates Celestial
    From: Lu Abel
    Date: 2016 Jan 23, 22:19 +0000
    As discussed last time, several of these would be technologically difficult or  impossible and the vast majority of them acts of war, at which point whether a US Navy ship could accurately navigate would be very far down the brass's list of worries. 

    And what about celestial's shortcomings?  For example, I suspect celestial is not very useful for any ships off the coast of the northeastern US this weekend (for those who are not from the USA, the entire eastern coast from well below Washington DC to well beyond Boston is being hammered with one of the worst winter storms in decades)

    From: Robert Swartz <NoReply_Swartz@fer3.com>
    To: luabel@ymail.com
    Sent: Friday, January 22, 2016 11:47 PM
    Subject: [NavList] U.S. Naval Academy Reinstates Celestial

    What happens to GPS if:
    1) Signals are jammed or hacked
    2) Your electronics die
    3) Terrorists or rogue states use the system for targeting and the Government must degrade the signals or shut it down
    4) Killer satellites knock out ours or broadcast false signals
    5) Due to EMP from solar storms or nuclear detonation, the signals die

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