Helo, Garmin has three main geographic regions it caters for, but this only relates to geographic and Jeppeson(airfield) data, the units will work anywhere in the world from a GPS point of view. However if you buy the unit in the states for instance, and you move to Oz, you wont have airfield data like frequecies, names & co-ordinates, and you possibly won't have terrain data either, but the unit will still have the basic base map of the area. You'll have major towns and roads etc. I doubt the weather will work as I'm pretty sure it's only for the USA and part of Europe.
When they ship the units they load the info for that particular area, you can buy the memory cards with additional info if you like. If you're unsure of where you are going to work I'd wait before buying the unit, but then again you could sell it, I have always sold my old units when I have upgraded without much advertising. Good luck
