i was wondering why pilot of airbuses always use MDA filed PREF page on ILS CAT2/3 instead DA!
Hey,
you set the baro minima (eg. npa or ILS CAT I) in the MDA box (or BARO box depending on software versions). You set the RA minima in the DH box (eg. CAT II / III app). That's it, no big deals.
Cheers.