Dec 2013: All operations at and above FL290
Feb 2014: Aircraft operated under the IFR first registered in Australia after 6 Feb 2014.
Feb 2016: In large parts of Western Australia (Airspace classes A, B, C and E).
(This is co-incident with the mandatory requirement to fit GNSS to all IFR aircraft for navigation in Australian airspace.)
Feb 2017: All IFR operations at all flight levels
http://www.airservicesaustralia.com/...IRSERVICES.pdf
If you need a GTX330ES let me know. I might have one for a reasonable price in the new year after a substantial upgrade.