What is the source of the Gazetteer data for Australia

In Australia we like to use the same place name for multiple locations within the same state. This rules out the ability to use the Geocode All Places option as I am now finding places have been incorrectly selected. I am also finding that where a place only singularly exists, the coordinates are different to the various government gazetteers available for our states.

What is the source of the gazetteer data used in Rootsmagic 9.02 for Australia?