Unfortunately, most GPS systems have maps for the part of the world where they are sold, therefore, you would have to purchase one that has the ability to download and update maps from various nations of the world. Some of the newer ones have this capability, but not all.
Good luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)