If anyone can help on this one, I would greatly appreciate it.
In preparing for the JAA OPS exam, I have come across this question:
When a course is plotted at minimum time route, one passes from the air isochrone to the corresponding ground isochrone by applying to point K (original spot) a vector KK' which is equal to
wind at K.
wind at K'.
mean wind from the preceding ground isochrone.
mean wind up to the next ground isochrone.
and there seems to be some argument as to the proper answer.
Can anyone help?