I'm with LP here.
Why fly right along the CTA step?
Shouldn't you add a tolerence for tracking error?
It seems like some pilots treat their GPS's as infallible.
The scary busts are over live firing areas eg Greenbank/Canungra/Pucka.
We [ATC] aren't out to get you just trying to keep everyone safe.
Usually when we see someone closing on CTA we call up to warn you first.
Lots of times no reply from the aircraft but they do a sudden turn away from CTA.
Win/win.
G'day RAAFASA. How's the folks at Morton?
CD