The GLS approaches in Houston are setup just like a straight in ILS. The setup and execution is the same as for an ILS. You even use APP mode. That is the cool thing about it. There is really no procedural change at all. You simply dial in the GLS code in the nav radio and its identified in the same fashion as an ILS. The minimums for the approach are just as low as the Full ILS. No CatII or III though. The accuracy is linear as you would expect a gps based system in that it does not become more sensitive as you approach the antenna of a ground based station. I have not used or seen the SFO GLS procedures yet.


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