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    Re: Updated Transcript of Worsley's Log
    From: Robin Stuart
    Date: 2017 Jan 26, 08:04 -0800

    David,

           Thanks for positing this. My point really hinged on the idea that methods that required plotting would be a challenge under the conditions of the voyage. That would be more likely be the case for intercept/azimuth LoP's that would generally make use of parallel rulers but perhaps less so for Sumner's method which just connects 2 or more points on a chart. Since the calculation in just the time sight calculation done for multiple assumed latitudes Worsley could have used it if he thought his latitude was sufficiently uncertain.

            I would be interested to know what calculation method does Nicholl's prescribe for obtaining the LHA and hence longitude? Worsley uses a different but equivalent method to that used by Sumner in his book (see attached pdf file),

    Death to the Intercept Method!

    Regards,

    Robin Stuart



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