GMC 2011 Full-Size Truck Navigation System User Manual page 7

After you acknowledge the start
up information you will be able
to access the NAV (navigation)
and DEST (destination) functions.
Once accessed, you can enter or
delete information in the navigation
system or access other functions.
See instructions later in this section.
Every fifty times the vehicle is
started and the navigation system
is turned on, the Caution screen
appears. After reading the caution,
select OK to load the map DVD
information. If OK is not selected, all
control buttons except for NAV and
DEST can be accessed. You can
also press NAV to have this Caution
screen appear.
When getting started, set the
navigation system to your
preference or delete information you
may have entered using various
options.
Infotainment System 7