Kiwi Grey in answer yes, all GNSS is interoperable. Yes the Japanese MTSAT provides a WAAS signal. There is a reference station in Canberra since 1992 and another in Hawaii. At this point in time no WAAS signal is provided in our region. This is due to the need of a network of surveyed receiver stations to compare the GPS signal with known position. This data is fed to an uplink to the geostationary sat as an augmentation signal. Which is then transmitted over a wide area to improve the accuracy of our GPS.
xinhua2 for your information, if this WAAS signal was available in our area. CAT I approaches would instantly become available for ANY aerodrome on the continent. YHOT YBLA YLHR and many more before it. That terrible accident down at YWBL where a very experienced RFDS pilot undershot the approach because of refraction affecting the VASIS, All these types of accidents become a thing of the past. CAT I ILS type approaches to ILS type minima, available anywhere! That is the benefit of WAAS. It represents a bigger addition to safety than any form of monitoring. It has nothing to do with ADS-B. You can definitely say it prevents CFIT, especially in the approach area.
Now that GRAS is dead, the money allocated for placement of augmentation receivers for the networks required around every capital city can now be deployed around the entire country. If there is anyone in government reading this, WAAS is a greater benefit to the entire community. Aviation benefits but so does the entire community in more ways then just one single quantifiable improvment.
The biggest reason that we do not get WAAS is because if AirServices installs the ground system they cannot recoup any fees from its operation. IT IS A FREELY AVAILABLE SYSTEM. Unlike GRAS and the pseudo-argument about soverign control and being able to charge a fee per operator.
The signal from the MTSAT is already available as a fixed satellite signal within the GNSS constellation. All it needs is for the augmentation signal to be provided and a transponder turned on.
EDIT just to add, any TSO146 GPS has the ability to provide stearing to fly a WAAS augmented ILS type approach. No points for guessing the other argument and what will be provided if everyone get their ducks in a row.
TID edit