navigation TOYOTA PRIUS 2002 1.G Navigation Manual

50
1UE087a
When your vehicle is receiving signals from
the satellites, the “GPS” mark appears at the
top left of the screen.
The GPS signal may be physically ob-
structed, leading to inaccurate vehicle posi-
tion on the map display. Tunnels, tall build-
ings, trucks, or even the placement of
objects on the instrument panel may obstruct
the GPS signals.
The installation of window tinting may also
obstruct the GPS signals. Most window tint-
ing contains some metallic content that will
interfere with the GPS signal reception. We
recommend not to use the window tinting on
vehicles equipped with navigation systems. The GPS satellites may not send signals due
to repairs or improvements being made to
them.
Even when the navigation system is receiv-
ing good GPS signals, the vehicle position
may not be shown accurately or inappropri-
ate route guidance may occur in some
cases.

When driving on a small angled Y −
shaped road.
 When driving on a spiral road.
 When driving on a slippery road such as
in sand, gravel, snow, etc.
 When driving on a long straight road.
 When freeway and surface streets run in
parallel.
 After moving by ferry or vehicle carrier.
 When a long route is searched during high
speed driving.
 When driving without setting the current
position calibration correctly.
 After repeating a change of directions by
going forward and backward, or turning
on a turntable in the parking lot.
 When leaving a covered parking lot or
parking garage.
 When a roof carrier is installed.
 When driving with the tire chains installed.
 When the tires are worn.
 After replacing a tire or tires.
(a) Accurate current vehicle
p
osition may not be shown in
the following cases:

51

When using tires that are smaller or larger
than the factory specifications.
 When the tire pressure in any of the four
tires is not correct.
INFORMATION
If your vehicle cannot receive GPS sig-
nals, you can correct the current posi-
tion manually. For the information on
setting the current position calibration,
see page 77.
When turning at a wrong intersection off
the designated route guidance
 If you set more than one destinations,
auto reroute will display a route returning
to the destination on the previous route
when you try to skip any of the destina-
tions.
 When turning at an intersection, there is
no route guidance.
 When passing through the intersection,
there is no route guidance.
 During automatic rerouting, the route
guidance may not be available for the next
turn to the right or left.
 It may take a long time to operate auto re-
route during high speed driving. In auto
reroute, a detour route may be shown.
 After auto reroute, the route may not be
changed.
 An unnecessary U −turn may be shown or
announced.
 A location may have multiple names and
the system will announce one or more. 
Some routes may not be searched.
 If the route to your destination includes
gravel, unpaved roads or alleys, the route
guidance may not be shown.
 Your destination point might be shown on
the opposite side of the street.
 When a portion of the route has regula-
tions prohibiting the entry of the vehicle
that vary by time or season or other rea-
son.
 The road and map data stored in your
navigation system may not be complete
or may not be the latest release.
When replacing the tire(s), do the calibra-
tion. See page 77 for detailed information.
(b) Inappropriate route guid-
a
nce may occur in the follow-
i
ng cases:

52Map database is made based on the
maps, 2001 edition of DENSO, whose in-
formation source comes from NavTech
maps and GDT maps.
2000 Navigation Technologies. All
rights reserved.
GDT, Geographic Data T echnology, Inc.
This product contains proprietary and
confidential property of Geographic Data
Technology, Inc. Unauthorized use, in-
cluding duplication of this product is ex-
pressly prohibited. There
are two types of areas available for
route guidance. (See the following
pages.) In one type of area, primarily
around metropolitan centers, detailed
route guidance is available for the entire
area. In the other type of area, all roads
are displayed on the map but route guid-
ance is limited. The navigation route
might lack precision because the data (no
right turns, oneway traffic, etc.) is not
complete. It is still possible to reach the
destination by following the arrow direc-
tion and distance as shown on the bottom
left of the screen. The arrow points in the
direction of the destination. The distance
shown is as measured in a straight line
from the current vehicle position to the
destination area.
1UE088a
In order to provide you with accurate map in-
formation as much as possible, we are al-
ways gathering information such as road re-
pairs and doing site investigation. However,
the names of roads, streets, facilities, and
their locations are often changed. In some
places, construction on roads may be in pro-
gress. For that reason, information on some
areas in this system might be different from
the actual location.
Map database information and
u
pdates

77
The current vehicle position mark will be
automatically corrected during driving
on reception of GPS signals. If your ve-
hicle cannot receive GPS signals, you
can correct the current position mark
manually.
1UE040
1. Push the “MENU” switch to display
the Menu screen, and touch the “Set-
up” switch.
2UE0271
2. Touch the “Calibration” switch.
2UE0272
3. Touch the “Position/Direction”switch.
INFORMATION
For additional information on current
position accuracy, see “Limitations of
the Navigation System” on page 49.
Current position calibration