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    Re: U-boat Celestial Navigation WWII
    From: Jerry Mason
    Date: 2016 Apr 11, 14:24 -0700

    Hi Paul, I read your analysis with interest.  Thank you very much for sharing it.  I can see how that the corrections for time and latitude can be a source of error.  In my opinion, the biggest drawback to the use of the F-Tafle (compared to the similar H.O. 208) is the frequent and sometimes tricky interpolation that is required.  As a beginner, I am uncomfortable with estimating and so take up a lot of time doing the interpolation mathematically.  With the corrections for time and latitude sometimes a double interpolation is required.  The U-boat navigator must have gone through a lot of scrap paper and graph paper.  The 1941 Nautical Almanac also requires considerable interpolation.  I guess it was a way of making the tables as compact as possible.  It certainly makes one appreciate the modern Almanac and inspection table sight reduction tables like H.O. 229/249.  Jerry

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