What model do you have, what firmware, what map and what is not working?
The application (firmware) can be found by tapping the satellite bars. The next screen shows the version number. Now, tap the version number and the next screen shows the map and version installed.
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Sorry, your question wasn't too clear initially.........
You'll have to buy a map for Australia and install in on your unit. I'm not sure what model you have so I don't know whether you can install on a sd card or need to do it on internal (and perhaps copy your existing map to the computer so that you have sufficient space).
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