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    Re: Great Circle Course via calculator & HO 208
    From: Peter Hakel
    Date: 2016 Oct 7, 13:58 +0000
    Yes, and there’s an app for that. :-)

    https://navigationspreadsheets.wordpress.com/2014/07/28/composite-sailing/

    According to these calculations you don’t follow the original GC route to the limiting parallel; instead, the two GC portions are shifted from the original to have their vertices placed on the limiting parallel (note the magenta track in the blog entry drawn on top of the image taken from Bowditch).


    Peter Hakel
    http://www.navigation-spreadsheets.com/navigation_triangles.html#composite



    From: Gary LaPook <NoReply_LaPook@fer3.com>
    To: pmh099---.com
    Sent: Thursday, October 6, 2016 3:33 PM
    Subject: [NavList] Re: Great Circle Course via calculator & HO 208

    Then you fly a "composite route." Lay off the great circle, on a globe, gnomic chart, or, last resort, compute it. See if there are dangers or travelling into high latitudes. Then plot the points where the GC crosses that limiting latitude and then sail the GC to the first point, a rhumb line between those points and then the GC for the rest of the voyage.

    gl



    From: Bill B <NoReply_BillB@fer3.com>
    To: garylapook---.net
    Sent: Thursday, October 6, 2016 2:03 PM
    Subject: [NavList] Re: Great Circle Course via calculator & HO 208

    On 10/6/2016 4:08 PM, Frank Reed wrote:
    > "I guess there could also be yet another kink around eastern Ukraine as
    > well."
    
    In the marine world, they may also  be good reason other than weather to
    not travel a great-circle route. Icebergs for one.
    




       
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