Note that on all of the newer (meaning, made in the last 2 years) Garmin units, you can upload maps of different countries into the units. By 'maps', I mean topographical maps (available for USA only) or street and road maps (available for North America and Western Europe).
Garmin also makes a product called 'WorldMap'. This provides reasonable geographical information - cities, towns, lakes, railroads, and major roads and highways - for the whole world. It can be uploaded to any of the newer units - although some of the Garmin units come with portions of the WorldMap already 'burned in' (meaning, permanantly loaded) into the unit.
The different map products come on CD's. You buy the CD, then use a computer (any computer) to upload the information into your GPS, using a serial cable.
The CD's range in price from about US$ 60 (for worldmap) to US$ 200 (all of Europe, or all of North America). Frequently, used CD's are advertised on eBay. Do a keyword search on 'Garmin' and 'MapSource' together (both words) and you will find them.
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