I would like to get a GPS device for car navigation in the US, but I have no prior experience with such devices. It is important for me that I be able to use the device in most other countries too (Europe & China in particular).
Can all (major brand) GPS devices sold in the US be updated (for a cost) for use in other regions, or are some of them permanently stuck with US maps? I would like to avoid having to buy a completely new device once leaving the US. I couldn't find a definite answer by googling for specific brands.