Oh yes...when they want to have RNP to GBAS, it appears we can get the minima down significantly...
In this case i'm not that sure that the obstacle is the limit. The approach and go-around path of both ILS and GLS are identical and therefore it should be possible to achieve a normal ILS CAT I minimum (current certification limit for GLS) and lateron a normal CAT IIIb limit which is what we have on the ILS. Sad thing is that currently the 737 is not able to follow curved approaches in approach mode, it needs to use LNAV/VNAV for that.
So, sir, is GLS totally FMS indepentent?
I believe that was the question at the start of this thread. We do not have a definite answer, but apparently it is. The approach path geometry is part of the GBAS datastream and the onboard multimode receiver compares the current 3 dimensional position against that received in the datastream and generates an ILS look alike signal to be displayed on the cockpit display system and to be used by the autoflight system.