Map Scales

+ / − (Zoom In/Zoom Out): Press the zoom in or out screen buttons or the scale on the bar to change the level of map detail. The scale appears on the screen once the zoom in or zoom out screen buttons are selected. The system adjusts the map accordingly. The scale of a map can range from 1/32 mi (50 m) to 256 mi (400 km). To change English or metric, see Driver Information Center (DIC)   for more information.

    See also:

    OnStar Additional Information
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    Vehicle Speed Messages
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    Driving on Wet Roads
    Rain and wet roads can reduce vehicle traction and affect your ability to stop and accelerate. Always drive slower in these types of driving conditions and avoid driving through large puddles and ...