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Turn-by-turn directions usually means pulling over and inputting your destination on a touchscreen. Today on most 2007 General Motors vehicles, you can get your navigation from the OnStar service. Press a button and tell the operator your destination; he’ll send voice directions that play over your speakers and display on the stereo screen. OnStar now also uses sensors to periodically check key systems—engine, airbags, brakes—and automatically send e-mail reports alerting you to necessary servicing. $300 per year; onstar.com
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