GPS is done with a few different technologies on the Backflip - if you gave Google permission to use your location, then the Google Maps program can use Cell phone towers, and Wireless networks to locate you within about 500M. If you turn on GPS you are using Satellites. GPS that works in USA should work in Australia - the satellites are still in the sky. As for Google Maps and cell towers and wireless access points, it depends if Google has done as good a job mapping everything in Australia as they have done in the USA.
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