Originally Posted by
rudestuff
Is it? If you're on vectors and extend the centerline, you'll still get calculated track miles and a vnav profile.
You'll get a profile, sure, but is it worth having? I don't doubt it will well work very well at some airports but I've certainly seen enough of a miss match between ATC track miles vs. calculated track miles when on vectors going into the likes of LHR to prefer to "use some other more "traditional" A/P modes" and the three times table.....