C.B. one must pay very close attention to the details on the charts namely on your example GPA is shown in brakets (most probably ending at 50 ft over the THR.) thus it's the data based and the NDB approach RWY 08 can be flown out of the box with vertical guidance yet must be monitored by raw data. VOBZ, on the other hand doesn't have GPA in brakets, meaning it's a geometrical projection from the THR 3 degrees upwards. Now you tell me, will you fly this approach in LNAV/VNAV mode? Most probably you'll end up flying it in LNAV monitoring the needle and going V/S or FPA on the vertical mode. Not really overlay if you ask me.
