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Chevrolet GMC Yukon 2005 Manual page 43

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To change the hours and minutes on the clock, do the
following:
1. Touch the Manual Adjust screen button.
2. Touch the up or down arrow screen buttons to
increase or decrease the hours and minutes.
3. Touch the Back screen button to return to the
previous screen.
12Hr/24Hr: This feature allows you to choose whether
the time is displayed in standard or military time.
Touch the 12Hr screen button for standard time or the
24Hr screen button for military time.
Auto GPS Update: With this feature on, the navigation
system time will be set to match the current GPS
time. The time will be updated with the GPS time when
the ignition is turned on. You may also touch the Off
screen button to turn this feature off.
Daylight Savings: With this feature on, the navigation
system will automatically adjust the time for Daylight
Savings. You may also touch the Off screen button to
turn this feature off.
Time Zone: This feature allows you to choose from
five different time zones: HST (Hawaii), PST (Pacific),
MST (Mountain), CST (Central), and EST (Eastern).
Touch the desired time zone screen button to select it.
Display Off
To turn the navigation screen off, touch the Disp Off
screen button on the Configure menu. To turn the
screen back on, press any hard key to the left of the
navigation screen.
Global Positioning System (GPS)
The navigation system determines the position of your
vehicle by using satellite signals, various vehicle signals
and map data.
The Global Positioning System (GPS) locates the
current position of your vehicle using signals sent by the
United States Department of Defense GPS satellites.
While your vehicle is receiving signals from these
satellites, GPS will not appear on the map screen.
However, at times, other interferences such as
the satellite condition, road configuration, the condition
of the vehicle and/or other circumstances can interfere
with the system's ability to determine the accurate
position of the vehicle. This is when GPS will appear on
the map screen.
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