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    Re: Another "emergency navigation" sightreductionmethod
    From: Francis Upchurch
    Date: 2015 Jul 14, 11:56 -0700

    Bon Voyage Gary!

    I would be very interested in Bygrave SR v Bygrave flat, v Hv Doniol.

    Maybe sometime in the future have a look at the BN? I think you will like it for aviation! (that is what it was originally designed for!)

    Very easy to make the basic prototype (2-3 hours max and virtually no cost). Should be good enough for a one- off trial. (mine is still working fine after several weeks hard use). My polycarbonate definitive version for long  term sea going use, probably last forever.

    Best wishes

    Francis

       
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