From this thread, it seems that many ATCOs are uncertain of the method of navigating, vertically, in modern (FMS-equipped) aircraft. In a couple of weeks' time, I would be willing to start an 'FMS Q and A' thread, and to do my best to answer any queries ATCOs have about these matters. Would this be a help? Are there any other experienced jet pilots out there willing to pitch in with answers, too? (I'm currently on Boeings - and mahogany bombers, so not a sharp as once was - but with previous 'bus technology experience. Is there a currect 'bus driver who might give that persepective?)
Or am I miles off?