NISSAN 2012 Titan - Navigation System Owner's Manual - Manual (Page 212)

Black plate (214,1)
Model "NAV0-N" EDITED: 2009/ 7/ 6
NAV3046
ACCURACY OF POSITIONING
The color of the GPS indicator in the lower right
corner of the screen indicates the accuracy of
positioning as follows:
. Green: accurate positioning is possible
. Gray: accurate positioning is not possible
INFO:
For approximately 3 or 4 minutes after starting
the system, the GPS indicator remains gray,
even if accurate positioning is possible.
Positioning adjustment
When the system judges that the vehicle
position information is not accurate based on
vehicle speed and gyro sensor data calculations,
the system will automatically adjust the position
of the vehicle icon using GPS signals.
Receiving signals from GPS satellites
The reception of GPS signals can be weak,
depending on the environment. Vehicles in the
following areas/environments may not receive
GPS signals (indicator color: gray).
NAI0422
* Inside tunnels or parking garages
NAI0423
* Areas with numerous tall buildings
9-4 General system information