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    Re: Great Circle Initial Course Boston to Wellington?
    From: Gary LaPook
    Date: 2017 Dec 2, 00:12 +0000
    Your 215 computation is wrong.

    gl



    From: Bruce J. Pennino <NoReply_Pennino@fer3.com>
    To: garylapook---.net
    Sent: Friday, December 1, 2017 2:24 PM
    Subject: [NavList] Great Circle Initial Course Boston to Wellington?

    Hello:
    A New Zealand friend and I were just talking about a direct flight; distance and initial course from Boston. I easily calculated the distance using cosine D (distance) equation  from navigator's triangle and course using Cos A equation,etc. The distance is about 7,940 NM checked on-line and Cos A equation indicated Z about 215 degr. True. I looked at a globe and seems to make sense. But I wanted to check it with H.O. 208 Dreisonstok. Distance confirmed at about 7,920 ,NM, but initial course Z = 250 degrees?  Can't find a math error in either calc.  Initial great circle course is ???
    thank you and best regards.
    Bruce


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