Install NSW Geology Maps from the App Store on your iPhone/iPad - then all the state-wide geology maps and geophysics images can be conveniently downloaded within the app.
If you own an iPhone 4, this app will run nicely on it, but you will need to upgrade the operating system if you haven't yet done so. This is a fairly easy process, but if you have previously downloaded a lot of apps or data, you may need to have a bit of a tidy-up on your phone so the iOS upgrade can complete OK.
Alternatively, if you need to use one of the 350+ sheet maps (1:25 000 to 1:250 000), then install Galileo on your iPhone/iPad and use iTunes to sync the sqlite files with this app, or install Total Downloader on your iPhone/iPad to download the sqlite files into Galileo. Please use the Map List for downloading the sheet maps to iTunes or Total Downloader.