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    Re: Pub.229 GC-Calculation distance and course.
    From: Hewitt Schlereth
    Date: 2009 Dec 2, 14:56 -0400

    A tip o' the hat to that. Bless the gods for sines, cosines and
    calculators.  Hewitt
    
    On 12/2/09, John Karl  wrote:
    >
    >  > As I read it, what Guus seems to be asking is how they got the
    >  > additional .2'  they added to the course from the AP (246.1�) to the
    >  > course from the actual point of departure in Fremantle (246.3�).
    >  >
    >  > Hewitt
    >
    >
    > Yep, I think you're right.  I hadn't paid any attention to parts (4)
    >  to (6) below the example.
    >
    >  Part (6) requires a triple interpolation of Z among dec, LHA, and
    >  lat.  I skipped the lat interpolation because the 32*03' departure lat
    >  is so close to 32*.  Then my double interpolation of Z for LHA and dec
    >  gives me 66.25* rounding to the 66.3* on page XXI of H.O. 229.
    >
    >  All this is pretty darn academic compared to actual practice at sea --
    >  at least in my experience.
    >
    > JK
    >
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