As much as I love reading anything put out by Sinclair Knight Merz...
ACILAllen Augmented GNSS
...seriously, we should pull every GPS out of every aeroplane..TODAY! How could we fly behind such wildly inaccurate devices...whats WAAS, no mention. No matter what system it all suffers from inaccuracies. Spend money on rolling out Continuously Operating Reference stations.
Rant over. This is what the government already have in front of them regarding augmented GNSS. The productivity gains are impressive.