scanscanscan
Yes, of course it would be nice if we could instruct a pilot to fly a specific TRACK (for instance, three miles left of the centreline of Alpha two-five) and then treat it as though it was on a radar heading. Sadly, the rules and phraseology have not yet caught up with the technology available. To be sure, some controllers use the technique anyway, to good effect, but, should things go "pear-shaped" they know they will be "hung, drawn and quartered" for NOT ENSURING SEPARATION by an approved method.