Growahead: I'm with you. The two biggest waste of time, effort, staffing and money in the history of aviation in OZ have been NAS airspace and SDE. It still astounds me that there is this surveillance and controlled airspace down to 1500ft over Tasmania during the night with only two or three regular week day movements for the whole shift when Canberra airspace, during the same time, is uncontrolled Class G to 8500ft. Now there's security for you over the nation's capital when Joe Lunchbucket can load his aircraft up with fertiliser and fly it to Canberra and plunge it into Government House and nobody would know - or dare I say care!!