At about a third of an inch thick, the Nuvi 3790T is Garmin's thinnest GPS device yet.

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The 3790T is built around a capacitive 4.3-inch touch screen. It's a good size for visibility without sacrificing portability.

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Laid next to the more conventionally shaped Nuvi 1690 (another 4.3-inch unit), you can see how thin the 3790T's is.

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The home screen should be familiar to anyone who's seen a Garmin in the last 10 years; not much has changed here. What is new, but not pictured, is a portrait orientation triggered by the unit's internal accelerometer.

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Look closely and you'll see that the Nuvi subtly renders terrain and elevation data on its maps.

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In major cities, the 3790T also displays 3D building data when zoomed in close enough.

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When approaching freeway exits, graphic lane guidance shows users what lanes are valid for the chosen route, complete with road sign information.

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The rear panel consists of a black brushed metal with a glossy plastic section where the speaker and GPS antenna live.

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The car dock features a suction cup mount and a connection for the 12-volt car charger.

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Garmin has included the FM traffic receiver in the power cable's wire, so you must plug in before you can receive traffic updates.

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Traffic updates are free and ad-supported. Occasionally, users will see text ads like this one in the traffic menu or on the map screen.

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The car dock also features a more powerful speaker that increases in-car audibility of spoken directions and calls.

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After speaking a trigger phrase, the Nuvi goes into voice command mode.

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The voice command trigger phrase can be customized by the user. The system will even show you how accurate and unique your chosen phrase is.

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Hands-free calling is unlocked once a Bluetooth-enabled phone is paired.

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EcoRoute is a collection of tools and functions that help drivers to maximize their vehicle's fuel economy and minimize emissions.

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