Call the local airport and ask them what the Australian regulations are. In the US under FAA regulations, some crafts are not required to have ADS-B depending upon flying altitude. It’s going to become mandatory very soon including drones.
may be Aussies are behind in this.
It appears a lot of Cubes are experiencing IMU 3 failures. Accelerometer Calibration Fail
read this document. https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/17_phak_ch15.pdf