2009 GMC Acadia Owner's Manual - Page 472

XM NavTraffic™ (USA and Canada) Your vehicle's navigation system may have an XM NavTraffic receiver. XM NavTraffic is a subscription service provided via XM™ Satellite Radio. XM NavTraffic provides real-time traffic information fully integrated to the navigation system to display current traffic conditions for a driver's chosen route. XM NavTraffic allows drivers to make the most informed, timesaving routing decisions. If the Traffic touch screen button is pressed or if the traffic display in the Navigation Setup Menu is attempted to be turned on without a subscription, a warning screen displays indicating that XM traffic is not activated. Three types of traffic information for major roadways are displayed on the navigation system: • Unscheduled traffic incident data, such as accidents and disabled vehicles • Scheduled traffic incident data, such as road construction and road closures • Traffic flow information (rate of speed data) Traffic information is delivered to the vehicle by the XM™ Radio satellites. XM NavTraffic makes it possible for the navigation system to provide continuously updated traffic information personalized for a driver's needs. 2-28