Dangly Bits - The cross subsidisation was the original plan – that was to be paid for by the removal of the enroute secondary radars throughout Australia. That, in fact, was a ridiculous idea and never went ahead. No air traffic control service provider could ever rely on just one system – especially based on GPS which was still a pretty new technology. When it was decided that the secondary radars should remain, the economics of the cross-subsidisation were no longer viable.