Leadsled....how about explaining to the plebs what a GPS block III satellite will provide, what it is compatible with and whether it needs ground based signal error correction. How long before at least 21 satellites are transmitting and what accuracies are talked about...including the safety of life signal. AND what other satellites are already doing in our neck of the woods....Then, for encore, maybe an insight into how long we will have to wait for all this tech to make it onto an avionics circuit board.