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I saw that in Jeppesen airway manual but I didn't find a definition for it. What is that?

How to establish it? Who establishes it and for what reason?

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enter image description here

from http://code7700.com/high_latitude.htm

Apparently defined by Transport Canada:

https://www.tc.gc.ca/media/documents/ca-publications/AIM-2018-1-E-ACCESS.pdf

page 192

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  • $\begingroup$ Pondlife, how are you able to make the .png show up like that? $\endgroup$ – CrossRoads May 6 '18 at 1:09
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    $\begingroup$ click 'edit' and study the changes. $\endgroup$ – Peter Kämpf May 6 '18 at 2:32
  • $\begingroup$ @PeterKämpf to be precise they should click "edited X hours ago" $\endgroup$ – Federico May 6 '18 at 6:18
  • $\begingroup$ @Federico: That is even better, agreed. I learned MathML by clicking 'edit' on posts where I wondered "how the heck did they do this?" $\endgroup$ – Peter Kämpf May 6 '18 at 7:50

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