50
Before
UseGetting
startedRoutingAddress
Book
Vo i c e Recognition
If necessary
GPS is a position detecting system utilizing the signals
from GPS satellites deployed by the U.S. Department of
Defense. The Mobile Navigation System uses input from
three or more satellites and calculates the vehicle position
based on the principle of triangulation.
The positioning accuracy of the system corresponds to the
error display of the GPS which is from about 30 to 200 meters.
lIf you are using the system for the first time, or if you have not used it for some time, it takes
about 5 minutes (or about 2 minutes in open areas) to calculate your vehicle’s position.
nGPS signal reception is poor in the following places
lThe GPS satellites are controlled by the U.S. Defense Department, which may intentionally
lower positioning accuracy. In such cases, there may be vehicle position deviations.
lThere may be vehicle position deviations for some time until GPS signals are received after
turning on the ignition.
This function compares your vehicle’s tracking data with the road data on the map
disc, applies dead reckoning to determine the road you are driving on, and displays
your vehicle on that road on the map.
lIntelligent map matching addresses the following problems to achieve high accuracy in
vehicle positioning.
Position Correction for Elevated RoadsPosition accuracy is improved by detecting if the vehicle is
running on or under an elevated road.
Position Correction for Parking GaragesPosition accuracy is improved by detecting if the vehicle is
driving in an elevated or underground parking garage.
High-precision GyrosensorA gyro detects turns with an accuracy of 0.05° per second.
Combined with a speed sensor, it enables the system to
display the current vehicle position even where GPS signals
may be blocked.
lUsing a spare tire in place of the regular one may cause vehicle position deviations.
lAny difference between the direction which your vehicle actually travels and that shown on
the map is automatically eliminated by azimuth correction.
GPS
In tunnelsAmong high-rise buildingsUnder elevated roads In wooded areas
Map Matching
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52
Before
UseGetting
startedRoutingAddress
Book
Vo i c e Recognition
If necessary
Although you may encounter the following problems in a route search, there is nothing
wrong with the system.
The navigation system is just a support system for the driver. The driver should always pay
attention to the traffic situation to safely make decisions. You may be unable to arrive at your
destination due to out-of-date information on a map disc. You should be especially careful
when selecting an urgent destination such as a hospital or a police station.
Route Search
Warning
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It may also show roads
that are out of use due
to the opening of a new
road or for other
reasons.
The route shown only
reaches a point near
your destination if your
destination has no
direct access road or
the road is too narrow.
It may show a route
where you'll have to
make a U-turn.
The guide map may
show roads that are not
passable due to closure
in winter or for other
reasons.
It may show a
common road under
or over an elevated
road. DestinationRoad
out of
use
which
exit?Destination
Destination Destination
Depending upon the shape of
roundabout (rotary), the guide
map may show a wrong exit.
where the route remains
unchanged after another
search. • There may be cases
• A congested route may
be shown.
It may also show
roads that only permit
one-way traffic.
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