John,
A good question. How one works out the
the point of intersection of an electronic glide path with the applicable DA
is anybody's guess; the profile table doesn't go down that low. Complicating matters is that you fly
over the DME and out the other side before getting to the MM (0.5 DME south of the DME site - how would you set that up on your GPS, Doc?).
The logical answer would be to conduct conduct the MA at the MM ala the LLZ. If you're past the MM, do it immediately. Legally? Who knows. Methinks MAPs such as the one at CNS need more explanation.