Poor Capt. Paco
You really don't get it do you?
I was the one that introduced the word departure into the discussion in the first place as an example of the nonsense in the JAA ATPL TK.
I hope you don't brief too many people on your incorrect knowledge of the true meaning of departure.
I quote your post here:-
'Departure is a word that refers to a distance in nautical miles in places other than the Equator, where it is referred to as ch long. More technically, it is the distance made good in an E-W direction along a rhumb line.'
Your definition is completely wrong.
You say departure is ch long.
It is not ch long it is ch long * cos (lat)
You say the definition is not valid at the equator
- well it is because cos (0) = 1
Good luck with your CRMI instruction.