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    Re: The Great Circle Challenge
    From: Stan K
    Date: 2014 Dec 27, 08:06 -0500
    4069 looks right to me.


    -----Original Message-----
    From: Francis Upchurch <NoReply_Upchurch@fer3.com>
    To: slk1000 <slk1000---.com>
    Sent: Sat, Dec 27, 2014 7:41 am
    Subject: [NavList] Re: The Great Circle Challenge

    Having a bad day. Repeat Bygraves give 4069nm.
    Which  is correct?
    Francis
     
    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Francis Upchurch
    Sent: 27 December 2014 12:21
    To: francisupchurch---.com
    Subject: [NavList] Re: The Great Circle Challenge
     
    Apologies I made an error on the Bygrave. Several check repeats now give 4059 nm distance. 25˚55’ course.
    Francis
     
    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Francis Upchurch
    Sent: 27 December 2014 09:41
    To: francisupchurch---.com
    Subject: [NavList] Re: The Great Circle Challenge
     
    Merry Xmas Navlist folk.
    The following probably adversely affected by seasonal excesses.
    Bygrave: Course 25˚55’, dist 4063nm. Took 2 minutes. (substitute Dec= arrival lat, LHA (t) = difference longitude.)
    Brown-Nassau prototype: Course 26˚. Dist 4070nm. Took 1min 30 secs approx.
    What is the best ,correct answer?
    Best wishes,
    Francis Upchurch
     
    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of David Pike
    Sent: 26 December 2014 16:21
    To: francisupchurch---.com
    Subject: [NavList] The Great Circle Challenge
     
     
    The Great Circle Challenge
     
     
     
    Clearly, from recent posts, we all have a favoured way of solving great circle sailings (which we’ll probably never use for real).  Let’s put them to the test by trying something a bit more complicated like a southern to northern hemisphere crossing combined with a crossing of 180degrees E/W.  How about emulating Captain Cook by travelling from Cook Strait (CS), New Zealand to Waimea Bay (WB), Kauai, Hawaii?  Cook followed the pretty route, but we’ll go direct by great circle.  The coordinates are CS 41d 30’S, 174d30’E to WB 21d57’N, 159d 40’W.  Use your favourite method and report back on your answer, the time it took you, and any difficulties encountered.
     
    I’ll stick with the diagram method, because at least I’ll know what I’m trying to prove, and I won’t have as many rules to remember and apply which might or might not work.  Dave
     
       
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