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    Re: U-boat Celestial Navigation WWII
    From: David Pike
    Date: 2016 Jan 9, 14:01 -0800

    Jerry Mason wrote:  Sine the NAVList is about navigation it may be noted that the boat was also equipped with an Elektra-sonne navigation system https://en.wikipedia.org/wiki/Sonne_(navigation)

    The amazing thing about Sonne (Allied name Consol) was that the Allies never jammed it.  They found it as least as useful as the Germans did, and probably more so once the balance of power swung in the Allies favour.  I used Consol in the Varsity in 1968/9.  It was a good aid.  Not as good or easy to use as GEE Mk3, but on a par with GEE Mk2 for ease of use if somewhat less accurate.  Its advantage was its much longer range and the fact that all you needed was a radio receiver.  You did need to know roughly where you were to start off with, but the sectors were quite wide, so that wasn’t normally a problem.  I recall using Stavanger, Ploneis, and Bush Mills (a post WW2 station I believe).  I recall Stavanger was LEC transmitting on 319kcs.  The sequence went LEC in Morse code, a steady section for DFing if you wished, then a run of up to 60 dots and dashes separated by an equisignal.  Eg 38 dots, equisignal, 18 dashes. You are on a 40 dots line.  There were rules for the maximum and minimum count you should accept.  It was also possible, if you flew fast enough across the hyperbolae which were being swung through the sky electronically, to ‘race the count’.  There was little chance of that in the Varsity. DaveP

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