OK,
I am checking back with the Chiefs on this. The last I was aware, the system was down until HW can provide a more robust signal not prone to jamming or other interference.
We had just been talking about RNP to GLS final, but they told me there was currently no operational system in the US to look at this potential.
We were also under the impression that the FAA isnt really going to support GLS as a single point operation due to the assumption that it is a single point failure scenario.
Agian, I will get back to you as soon as I get a response.