One of the benefits of portable navigation systems is voice-guided directions, and if you've got an in-car GPS that has text-to-speech functionality, even better. Continuing along those lines, there's a new technology that's just starting to show up in devices now: voice commands. With this capability, you can perform certain tasks with the sound of your voice. Since this is an emerging trend, there are just a handful of units with this feature, including these three from top manufacturers TomTom, Magellan, and Garmin.
(Credit: CNET Networks)
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