I have no problem accepting the fact that GPS (LPV) is not classified as a precision approach. Actually other than criteria for selecting an alternate it has little effect. I am a little puzzled about GLS however. My understanding is that the acronym means Global Navigation Satellite System Landing System. The AIM indicates that this is a precision approach dependant on WAAS and LAAS. Are there any in existence in the US, in the World? Another question, is this the approach of the future, and just exactly when will these LAAS installations be started, completed?