Extra Information

72 Navigation
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. When the vehicle
is not receiving signals from the
satellites, a symbol appears on the
map screen. See Navigation symbols
3 57.
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.
■ Satellites are being repaired or
improved.
For more information if the GPS is not
functioning properly, see Problems
with route guidance 3 73 and
Service of the navigation system
3 73.
Vehicle positioning
At times, the position of the vehicle
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 in sand,
gravel, and/or snow.
■ The vehicle is travelling 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 travelling 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.
■ Tyre chains have been installed.
■ The tyres are replaced or worn.
■ The tyre pressure for the tyres is
incorrect.
■ This is the first navigation use after
the map data is updated.
■ The 12-volt battery is disconnected
for several days.
■ The vehicle is driving in heavy
traffic where driving is at low
speeds, and the vehicle is stopped
and started repeatedly.