MRJT Flight Planning question.
With regards to CAP697, MRJT 1, Figure 4.3.1a
(or any of the "simplified flight planning" charts)
When you start out at the bottom, with the "Trip Distance, Nautical Ground Miles" you then have the option to include a mean head/tailwind for the trip.
The example trip is 350nm, with a 50kt headwind.
Why then, would the line go straight up to the REF line, and *then* follow the curve. What if you had an 80kt tailwind, or a 30kt tailwind... ?? Surely you wouldn't just go straight up... perhaps tailwinds don't count? I'm baffled.