I wanted a handheld GPS unit for use in cities. I finally bought a Garmin nuvi 205 after taking size and cost into consideration. However, I've often wondered about the really small GPS units. Can they be used in cities, or are they exclusively for use in the wilderness? I ask because all of the maps I've seen for downloading into these small units are for use in places like Yosemite, etc. Can't you download regional maps, including city streets into these units?