I came Downunder in 1980 so wasn't aware of most of that. What a good job they got it sorted out fairly soon after it was needed.
Actually, I think my comments about Navtex were in error, the warnings that came out covering unwanted areas probably came out of the Sat C. There was no way of stopping them and consequently they were largely ignored. Luckily, at that stage, I was still there to get proper navigational warnings from other humans.
I'm not sure when they got Navtex going in Australia, but I suppose they did.