There are other features that you can get with specific manufacturers. Garmin is coming out with a unit that responds to voice commands. Magellan has teamed up with AAA to include their Tour Book with many of their GPS navigation systems. And Tom Tom is experimenting with a user generated database of points of interest, which is neat because users can record changes much faster than the company can.
Comparing GPS navigation systems is not hard once you learn what's out there and how much it costs. Your next step is to visit some sites and gather more information about price and exactly which units do what.
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