Black plate (71,1)
Chevrolet/GMC Express/Savana Navigation System (GMNA-Localizing-U.S./
Canada-7639741) - 2015 - crc - 4/28/14
Infotainment System
71
Day + or Day
−
:
Press the day + or
day
−
display buttons to increase or
decrease the day.
Global Positioning
System (GPS)
The position of the vehicle is
determined by using satellite
signals, various vehicle signals, and
map data.
At times, other interferences such
as the satellite condition, road
configuration, the condition of the
vehicle and/or other circumstances
can interfere with 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 of the United
States Department of Defense.
When the vehicle is not receiving
signals from the satellites, a symbol
appears on the map screen. See
Navigation Symbols on page 46
.
This system might not be available
or interferences can occur if any of
the following is true:
.
Signals are obstructed by tall
buildings, trees, large trucks,
or a tunnel.
.
Objects are located on the rear
shelf of the vehicle.
.
Satellites are being repaired or
improved.
For more information if the GPS is
not functioning properly, see
“
If the
System Needs Service
”
and
“
Problems with Route Guidance.
”
Vehicle Positioning
At times, the position of the vehicle
on the could be inaccurate due to
one or more of the following
reasons:
.
The road system has changed.
.
Driving on slippery road surfaces
such as in sand, gravel and/
or snow.
.
Traveling on winding roads or
long straight roads.
.
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.
.
Traveling at high speed.
.
The vehicle changes directions
more than once, or when the
vehicle is turning on a turn table
in a parking lot.
.
The vehicle is entering and/or
exiting a parking lot, garage or a
lot with a roof.
.
The GPS signal is not received.
.
A roof carrier is installed on the
vehicle.
.
Tire chains have been installed.
.
The tires are replaced or worn.
