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    Re: Marq St. Hilaire - Altitude intercept method
    From: Andrés Ruiz
    Date: 2007 Oct 26, 08:52 +0200

    In messages: [NavList 3572], [NavList 3588], [NavList 3596] There is an error of concept.
    
    Gary is not absolutely correct.
    > St. Hilaire's method created the exact same LOP as Sumner's method but 
    > only required doing the computation one time, saving work and reducing 
    > the chance for an error.
    
    The Sumner and the St-Hilaire LoPs are not the same. One is secant to the 
    circle of equal altitude and other is tangent. This means that the points in 
    common between the CoP and the each LoP are different. If You get the 
    analytic equation of each LoP on a Mercator chart You can see that the two 
    lines are not the same.
    
    For more details see the attached PDF.
    
    Please, I want to hear more opinions.
    
    Andrés Ruiz
    Navigational Algorithms
    http://www.geocities.com/andresruizgonzalez
    
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