ADS-B technology has been used in Australia since 2004. All IFR aircraft are now equipped with ADS-B Out and increasingly ADS-B Out is being used by the VFR fleet to increase situational awareness, enable tracking from home using popular tracking systems, to support SAR and to enable ATC services in some cases.
Whilst ADS-B Out is mandatory for IFR, ADS-B In fitment has been very slow in