For example, there have been several times where I have questioned an aircraft that was 0.5NM off track after the initial fix on an RNAV. More often than not they are just doing a visual approach, but if I see it I will ask.
The first thought that came to my mind when I read that was those guys in that EJet at Mildura and their near-miss with the Airvan. A call from Centre about their tracking when they could have been flat out on the CTAF.
That, Dick, is where and why your next accident is going to occur.
There would be nothing worse than being controlled by ATC on one frequency and sorting myself out with bugsmashers on the other frequency. And no, I'm not allowed to change to VFR.
SHOW US THE MONEY.