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Re: Flying to Antarctica
From: Brad Morris
Date: 2019 Jan 21, 11:12 -0500

Hello Kermit

Thank you for the referenced post! That did a much better job of reviewing the topic, by an actual pilot, then I could ever do.

I did encounter the grid referenced to meridian lines in the 1949 text. They indicated that the grid was made by drawing a line parallel to the 0 to 180th meridian. The direction away from the North Pole along the 180th meridian is "grid north".

The arithmetic is then (for north polar region) True direction plus west longitude equals grid direction. True direction minus east longitude equals grid direction. I am not quite sure what they mean by "true direction". Is that the instantaneous course on the standard latitude/longitude globe? I think so.

Your detailed post also described the weather. My reference states that the grid system simplifies in that the wind direction remains constant.

Brad

On Jan 21, 2019 10:32 AM, "Antoine Couëtte" <NoReply_Couette@fer3.com> wrote:

RE: Flying-Antarctica-Morris-jan-2019-g44042
Hello to all,
Let us not forget either about this accident when a DC10 hit Mount Erebus:
http://www.erebus.co.nz/background/thestory.aspx
This accident has been extensily studied in avaiiton Accidents, pointing out "latent errors" due to the false coordinates of Mount Erebus printed to the Flight Crew.
Let them all rest in Heavenly Peace.
And, as regards High Latitudes Air Grid-Navigation, it has been treated earlier, re:
http://fer3.com/arc/m2.aspx/Polar-Grid-AirNav-Oceanic-AirNav-Couëtte-dec-2017-g41064
Best Regards to all,
Antoine M. "Kermit" Couëtte
My former company also flew once a direct Buenos Aires - Perth ferry flight on the A340 heading to the West due to the very strong prevailing Westwards Jets.

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