My airline's vertical navigation data isn't certified for use and is considered 'advisory' only. But, 90% of the time it provides highly accurate data.
Some instructors at my company contend that 'localizer recommended altitudes' are required to be used as the primary / only reference for a CANPA style continuous descent to our DDA (derived decision altitude) on localizer approaches.
I contend that any method chosen for a descent to DDA is purely technique and as long as our advisory VNAV data is backed up with other data & looks accurate, there's nothing wrong with using it.
Are localizer recommended altitudes regulatory in any way? Is it legal to use an 'advisory' Vnav data to fine-tune your descent from the FAF to DDA? Any links, references, or regulations you can point me to on the subject would also be greatly appreciated.