I don't want to be pedantic, but wouldn't it be of greater benefit to other readers, particularly to students, if we used the term SBAS (Satellite Based Augmentation Service) to describe what we are talking about, rather than the terms WAAS (Wide Area Augmentation Service), which is the US FAA implementation of SBAS or EGNOS (European Geostationary Navigation Overlay Service), which is the European Space Agency implementation of SBAS?
There are other SBASs up and active, the Japanese have a system and I believe that the Indians have a system as well. No doubt others will be established in the future.
If this was an exclusively American or exclusively European forum, it would make sense to refer to the specific regional system - but our forum, and this discussion, is global.