I have a Garmin Streetpilot (older model) which I used in Europe after purchasing it on Ebay from a German motorcyclist. The main reason I purchased on Ebay was that I discovered that Garmin's have either European or North American base maps built in. You cannot (could not?) purchase the European version in the US or vice versa. Given the amount of world travelling that people do nowadays, this practice seems odd.
So, if you plan on travelling widely with the GPS, see if someone sells a world model.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13