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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@yahoo.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.

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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