SUBARU IMPREZA 2011 4.G Navigation Manual

Navigation 91
General Information
(10) The vehicle's mark could deviate from its actual position after
the tires have been replaced.
■ How the vehicle position is detected
Detecting the vehicle's position through the GPS
GPS stands for "Global Positioning Sy stem", which is a system used for
detecting an object's position through the use of satellites of the U.S.
Department of Defense.
Radiowave signals from three or more satellites are received by the
navigation system, which utilizes th e principle of triangulation to
detect the position at which the radiowave signals are received.
When the navigation unit is receiving the GPS radiowave signals, a
"GPS" mark will appear on the map screen.
Detecting the vehicle's position through self-contained naviga-
tion
Self-contained navigation is a system that detects the vehicle's posi-
tion by calculating the vehicle's driven distance and turning angle
though the use of various types of sensors that are mounted on the
vehicle.
Through the use of self-contained navigation, the vehicle's position
can be detected even in an area where the GPS radiowave signals
cannot be received.
Making corrections to the detection of the vehicle's position
through map matching
• In map matching, the position information resulting from the
detection of the vehicle's position and the locus of the travel of
the vehicle up to the present ar e constantly compared to the shape of the roads on the map in
order to correct the vehicle's
position mark to the most appropriate road.
• If the vehicle is driven on a road whose actual shape differs from
its map data, the vehicle's position mark on the map could devi-
ate from its actual position.
Occasionally, the correction of th e vehicle's position mark to the
actual road on the map can be observed, particularly after the
vehicle has turned at an intersection or has exited from a parking
area.
■ Accuracy of the route guidance
The conditions listed below do not indicate a malfunction.
(1) The guidance might prompt the driver to drive straight even
though the vehicle is being driven on a straight road.
(2) The directional guidance could display multiple place names.
(3) If the vehicle makes a turn at an intersection before the guided route, the wrong type of voice guidance could be outputted.
(4) The guidance might not be ou tputted while the vehicle is mak-
ing a turn at an intersection.
(5) The system might not be able to search for the proper route.
(6) If there is no road to the destination or if there is only a narrow road, the route might be indicated up to an area that is short of
the destination.
(7) The repeat search could take a long time while the vehicle is being driven at high speeds.
(8) While the system is searching again for the route, the route indi- cation might not appear in time for the next right or left turn.
(9) The route might not change ev en if a search is made again.
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92 Navigation
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(10) The system might guide the driver to make a U-turn.
(11) The system might guide the driver to a road that cannot actu-
ally be travelled (such as a road to which entry is prohibited).
(12) The system might not output guidance even if the vehicle is driven in reverse on the guided route.
(13) The system might not use a local ferryboat even if the ferry pri- ority is selected.
(14) If the intersection that you're being guided to is near the end of
the route search, the system migh t not be able to provide guid-
ance.
(15) The route might not go on a toll road even if the toll-road prior- ity is selected.
Similarly, a route that uses a toll road could appear on the
screen even if the toll-road priori ty is not selected. ( The driver
may or may not be able to select "toll-road priority" if both toll
and free roads are available.)
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When a Problem Occurs
Confirm whether the problem is due to a minor operational error or a malfunction in the system by referring to the table below
before you contact your SUBARU dealer for any repair service.
The map does not scroll even when the vehicle is moving.
The screen shown might not be the current map screen. See Page
19 of this manual for instructions on displaying the current map
screen.
The vehicle marker does not appear.
The screen shown might not be the current map screen. See Page
19 of this manual for instructions on displaying the current map
screen.
The GPS marker is not displayed.
The GPS antenna or your vehicle might be in a position where GPS signals
cannot be received. Try moving the GPS antenna or your vehicle to a position where there are no
obstacles around.
There is no voice guidance.
• Route guidance might be suspended.
• The guidance volume might be too low. •
See "Volume" on Page 18.
Small spots or bright flashes appear on the screen display.
This is probably due to the natural characteristics of the liquid crystal
display (LCD). There is nothing wrong with the display and no need for concern.
The DVD-ROM disc cannot be ejected.
The disc might be incompatible or might have been inserted incorrectly.
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