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    Re: Warning from the architect of GPS
    From: Lu Abel
    Date: 2014 Feb 14, 11:47 -0800
    Why would one have a Bygrave slide rule instead of a simple electronic calculator (solar powered, full trig, less than $10) that's substantially more accurate in doing sight reductions?

    We're talking about GPS being jammed, not the entire earth being subject to some EMP that destroys all electronics.  

    But wait, most watches these days are electronic....


    On 2/14/2014 11:01 AM, Gary LaPook wrote:

    Or a flat Bygrave with a long term almanac, either Kolbe's or the one from H.O. 249. Attached is a photo of the complete backup celestial navigation kit including the flat Bygrave and the H.O. 249 almanac.

    See:

    https://sites.google.com/site/fredienoonan/other-flight-navigation-information/self-contained-long-term-celestial-navigation-system

    https://sites.google.com/site/fredienoonan/other-flight-navigation-information/modern-bygrave-slide-rule

    gl



    From: Alan S <alan202---.net>
    To: garylapook---.net
    Sent: Thursday, February 13, 2014 8:01 PM
    Subject: [NavList] Re: Warning from the architect of GPS


    All:
    The comment from Paul Jackson regarding reliance on GPS brings the following to mind. The article was an interesting read.
    As Murphy said, Anything that can go wrong will. Otherwise, re ocean voyages, carry a sextant, add to that your favorite tables sounds like a good idea, the more one thinks about it, the better it sounds.
    Then there is the KISS principle too. A sextant and that favorite set of tables, add a quartz watch or G Shock if you fancy Casio sounds pretty simple to me.
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    View and reply to this message: http://fer3.com/arc/m2.aspx?i=126897


       
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