Man Flex...
You may well have been the first aircraft of the morning...the controller wants to know the "heading de Jour".
Also may have had another aircraft that he was going to parallel?
Loads of reasons.
If he wanted to know the "drift" surely it would have been easier to just ask the spot wind?
Ps, we used to use diversion radials off VOR's and headings off NDB back in the dark old days of Oz procedural control, so DP it did used to happen!!
