Cadillac 2009 XLR Owner's Manual page 228

Calibrate Vehicle Speed Signal: If there are tire
pressure differences or if a spare tire is installed, the
navigation system automatically recalibrates the system.
To manually calibrate the system:
1. Touch Start to begin calibration.
2. Touch Return to exit this menu.
Time to Destination
This feature allows you to view the estimated time to
travel from your current position to the destination, and
to reset the average speed to factory default settings.
Estimated travel time is based on calculated route
information and the vehicle's average speed. Touch ON
to turn this feature on, OFF to turn this feature off, or
Reset to restore vehicle speed default settings. With this
feature on, the estimated travel time to destination
displays along with the distance to destination.
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Quick POI (Point of Interest) Selection
This menu allows you to choose a point of interest (POI),
such as gas stations, restaurants, hotels, etc. to be
displayed on the map screen. You can also set a
destination to a specific POI.