I dont think there is a such thing as a "world map"
As far as i know, there are only continental DVD sets (if you have DVD based unit) or you are stuck with CD-s that are for each country (they do include major roads for the area)
For island you would have to get currently EU DVD 2009.1 that will cover rest of the EU as well. For the states you would get USA 2008.2 and there is middle east and so on.

(PS. in order for the latest DVD maps to work on MK IV unit you nead to update to latest software, so the unit can read dual layer discs)
Software is downloadable from the forum (se V32) and it is realy easy burn and install

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