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    Re: Snellius Construction questions
    From: Nicol�s de Hilster
    Date: 2009 Jan 08, 22:03 +0100

    Todd Frye (NavList@aol.com) wrote:
    > I have found an intriguing example of triangulation from a 16th century 
    mathematician, Willebrord 
    Snellius(http://www.sailingissues.com/navcourse4.html). I have searched other 
    web sources on the web and so far, have had no success in finding a straight 
    forward explanation of how this method of triangulation works. Have any of 
    you actually used the "Snellius Construction" technique, and could you help 
    me understand it as a practical navigation application?
    When I studied hydrography back in the eighties we did use Snellius' 
    method from the roof of our survey vessel's bridge. We used chimneys and 
    church towers with known coordinates and solved the resection 
    mathematically. Later on I have been on projects where either station 
    pointers or 'circle charts' were used to solve the position. A circle 
    chart looks similar to a Decca chart, but now covered with circles that 
    resemble the angles measured.
    You can find two examples of station pointers on my web site at 
    http://www.dehilster.info/instrumenten/stationpointer1/index.html and 
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
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