Garmin opens more for online users. Now they give an option to download maps for major cities in North America and Europe (without buying the whole map).
http://www.garmin.com/garmin/cms/site/us/lang/en/cityxplorer/
Good or not, may be useful for one time short visit.
http://www.garmin.com/garmin/cms/site/us/lang/en/cityxplorer/
Good or not, may be useful for one time short visit.