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    Re: New compact backup CELNAV system
    From: Brad Morris
    Date: 2009 Feb 27, 09:22 -0500

    Hi Bill


    Bygraves (and their cousins) appear from time to time on eBay.


    You will be competing with slide rule collectors, militaria collectors and celnav aficionados.   Be prepared to spend a lot of cash. 


    Slide rule collectors like this, the Fuller and other cylindrical rules like the Otis King.  Cylindrical rules command high prices but come with the advantage of increased accuracy, due to the length of the scales.


    Militaria collectors, like http://www.atlantik-pirat.com/Der%20Atlantik-Pirat.htm  , treasure these high end instruments for the history involved.   They are spectacular.


    Of course, celnav aficionados want it to reduce the drudgery of hand computation or for the backup celnav system.  They un-questionably provide the solution to the navigational triangle, providing an answer in very rapid time.  When you compare HO229 with the Bygrave, you save time and space (a complete set of HO229 is massive compared to a Bygrave).  What you lose is some accuracy and some resolution, something not particularly relevant for a backup navigational system.


    The LaPook-Bygrave is considerably cheaper, there is no comparison whatsoever.  An antique Bygrave will cost you a fortune, the LaPook-Bygrave almost nothing!


    Best Regards




    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of William Sellar
    Sent: Friday, February 27, 2009 8:47 AM
    To: NavList@fer3.com
    Subject: [NavList 7452] Re: New compact backup CELNAV system


    I am mostly a lurker on this list.  I am a beginning cel navigator and may be the person that Gary created this for - a voyaging sailor who is interested in Celnav primarily for backup to electronic navigation.  While I cant say that I have figured it out, I have printed out the material that Gary provided and I feel that I will be able to use it.  Well done Bravo. 


    Are there Bygraves on the market?  I have not found any.






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