Roger,
It's probably worth piping up since I've just finished reading the Coroner's report tonight, that he recommends that 'the NPWS review it's capacity to to educate the public as to the availability of PLB's from Police and the NPWS'
and that 'the Duke of Edinburgh Award Scheme amend its literature to require co-ordinators to educate candidates about…the value of one candidate in any walking group carrying a PLB where those devices are available from Police or NPWS'
It's not clear whether those were 121s or 406s in 2006, or whether or not they were or are now GPS equipped.