Ixixly,
Understood, aeronautical data in Oz suffers from inaccuracies over time mainly due to the different datums they have been surveyed in.
Eg. Many airfields were originally surveyed in AGD66 and the conversion to WGS84 is epoch based. Some agd66 positions have been published as wg84 and can be up 200m in error. We are still recieving data from Perth in Perth Coastal Datum and Adelaide in SA local.
175 has been created to try to solve some of these problems, but there is a long way to go.
Eg try telling the aboriginal elder at Kalkgurung that his data is incorrect.....they just dont understand