Buick Regal User Manual page 70

Press to change the
screen background.
The Automatic setting adjusts
the screen background
automatically depending on the
exterior lighting conditions.
The Day setting brightens the
map background.
The Night setting darkens the
map background.
To change the overall brightness
setting for the display, use the
vehicle interior lighting instrument
panel illumination control.
The position of the vehicle is
determined by using satellite
signals, various vehicle signals,
and map data.
At times, other interference such
as the satellite condition, road
configuration, condition of the
vehicle, and/or other circumstances
can affect the navigation system's
ability to determine the accurate
position of the vehicle.
The GPS shows the current position
of the vehicle using signals sent by
the GPS Satellites. When the
vehicle is not receiving signals from
the satellites, a symbol appears on
the map screen. See
.
This system might not be available
or interference can occur if any of
the following are true:
Signals are obstructed by tall
buildings, trees, large trucks,
or a tunnel.
Satellites are being repaired or
improved.
For more information if the GPS is
not functioning properly, see
and
.
At times, the position of the vehicle
on the map could be inaccurate due
to one or more of the following
reasons:
The road system has changed.
The vehicle is driving on slippery
road surfaces such as sand,
gravel, or snow.
The vehicle is traveling on
winding roads or long straight
roads.
The vehicle is approaching a tall
building or a large vehicle.
The surface streets run parallel
to a freeway.
The vehicle has been transferred
by a vehicle carrier or a ferry.
The current position calibration
is set incorrectly.
The vehicle is traveling at high
speed.