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For less than $1,000, you can buy a portable navigation unit with most of the features of a $2,000 in-dash system.
Portable navigation systems for cars have come a long way in the four years since we last tested them. In features and functionality, the best now rival some expensive built-in systems, which are available in many high-priced vehicles.
Using Global Positioning System (GPS) satellites, these navigation systems continually track the vehicle's location and provide electronic maps that automatically scroll as you drive, turn-by-turn screen directions, and a database of thousands of points of interest, including ATMs, gas stations, restaurants, ...