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    Re: Mercator Sailing and Meridional Parts
    From: Gary LaPook
    Date: 2014 Dec 2, 03:13 -0800
    See attached from the 1945 U.S. Army Air Corps navigation manual.
    gl


    From: David Pike <NoReply_DavidPike@fer3.com>
    To: garylapook---.net
    Sent: Sunday, November 30, 2014 12:31 PM
    Subject: [NavList] Mercator Sailing and Meridional Parts

     
    I found a scrap of paper of my fathers today from the 1950s containing a calculation for a course and distance for a sailing between Mukle Flugga and Troena Island (below).  Eventually I worked out it must be a Mercator Sailing, which I’d not heard of although I had heard of Plane Sailing.  I’d not seen the use of Tabular Logs before either as per NoriesTtables (9. instead of bar one), so that took a bit of getting used to.  Having now discovered Meridional Parts, I’m a bit flummoxed to understand why the ones in Nories Tables for the Terrestrial Spheroid  come to less than latitude x 60 from 0 degrees to 11.5 degrees before they start racing ahead.  Is this because of the compression of 1/293.465 whatever that means?
     


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