GMC Yukon Denali 2005 Manual page 24

Map Color (Night): This feature allows you to adjust
the nighttime map appearance. Choose between
Normal, Auto, 1, 2, 3, or 4. The numbered settings vary
the color scheme of the map display. The Auto setting
will change the map appearance automatically every
three months. When the desired color setting has been
selected, press the NAV hard key to view the adjusted
map color.
Calibrate System?: This feature will calibrate wheel
speed to assist in the calculation of vehicle position.
This feature also allows you to manually reposition the
vehicle symbol on the map. You may need to calibrate
the system following a tire change, rotation, or if
your vehicle has been relocated a great distance.
Touch the Yes screen button to calibrate the system, or
the No screen button to leave the calibration as it is.
Select Defaults?: This feature allows you to restore
all available factory default settings in the Nav Setup
menu. Touch the Yes screen button to restore defaults,
or the No screen button to retain the current settings.
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Memory Points
Touching the Memory Points screen button will display
the Memory Points menu. This menu contains options
for registering, deleting, and editing marked points
stored in memory, such as memory points, preset
destinations, and areas to avoid.
Memory Points: Choosing to add a memory point will
take you to the Destination menu. You may register up to
30 memory points. The name, location, information, and
icon for a memory point may also be edited.