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    Re: U-boat Celestial Navigation WWII
    From: Jerry Mason
    Date: 2016 Jan 8, 04:47 -0800

    Many thanks to Gary LaPook for the interesting references concerning the HR Position Line Slide Rule whch I was completely unaware of.  I am looking into this with my Germn U-boat contacts.  I have learned that the German version of the Nautical Almanac was the Nautisches Jahrbuch and the rough equivalant of HO229 was F-Tafel : Tafel zur vereinfachten Berechnung von Höhenstandlinien.  I am wondering if any other references were necessary.  In 1944 some U-boats deployed with a gyro sextant which was spun up with compressed air and then used to take sights without a clear horizon.  I recently translated the war diary (KTB) for a boat that carried this device and made some comparisons with the regular sextants.  You can see the KTB here http://uboatarchive.net/KTB1228-2.htm 

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