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    Re: DR by any other name....
    From: John Huth
    Date: 2010 Dec 31, 10:16 -0500


     Here's the earliest instance of the term dead reckoning I could find in a cursory Google advanced book search.   This is from a publication in 1694 - it's a publication of several journals.   This particular passage is from a piece titled "Journal, In His Magesties Ship the Speedwell, Captain John Wood Commander, Bound for the Discover of a Passage to the East-Indies, by the North-East:  Sailing about Nova Zembla, and Tartary and so to Japan.  1676."
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    Saturday, June 17.  From the 16.Noon to this Day Noon, a fresh Gale at West-north-west and West, with Rain and cloudy Weather.   Course per Compass North-east, distance sailed by the Log 127 Miles, difference of Lat. 90 Miles, departure East 90 Miles, Lat per Judgment 69 d. 48 m. Meridian distance 303 Miles, but by a good Observation at Noon Lat. 69 d. 53 m difference of Lat. between the Dead Reckoning and Observation is 9 Miles, which imputed to a westerly variation, which is found by an Azimuth 7 d. Meridian distance corrected is 300 Miles; fair Weather. 

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    I noted the use of "Judgment" many times for what appeared to be synonymous with Dead Reckoning - but I need to read the whole journal to get a sense of the usage.
       
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