Cadillac Automobile Owner's Manual page 240

Important Notes regarding OnStar
Destination Download:
If the navigation system is
turned off when the destination
download is attempted, the
navigation system will
automatically turn on and display
the OnStar Destination
Download Screen. The radio will
remain on after the download
occurs.
If OnStar downloads a
destination and the address is
not found in the mapping disc s
database and routing by
coordinates is not available, the
GO and Map buttons gray out
and routing will not be available.
Press the blue OnStar button for
further assistance.
The Call button grays out when
there is no phone number
available for your destination
and while connected to OnStar.
If the map screen is used to show
destination, it will have map screen
capabilities such as GO, Mark,
Zoom, Scroll, etc. The address is
shown at the top of the screen.
Once a destination has been
entered, there are several functions
that can be performed. Press DEST
to access the Route screen.