here are new regulations and aircraft equipment mandates in place to support communications, navigation, surveillance and air traffic management (CNS/ATM). In December 2014, CAO 20.91 (Instructions and Directions for Performance-Based Navigation) and CAO 20.18 (Aircraft equipment – basic operational requirements) were revised and re-published. CAO 20.18 advises of the equipment (ADS-B and GNSS) mandates to be met between December 2013 and February 2017. The CAOs affect all IFR pilots and aircraft operating in Australia.