2002 Lexus IS 300 Navigation Manual - Page 55

2002 Lexus IS 300 Manual

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Limitations of the Navigation System This navigation system calculates the current vehicle position using satellite signals, various vehicle signals, map data, etc. However, an accurate position may not be shown depending on the satellite condition, road configuration, vehicle condition or other circumstances. The Global Positioning System (GPS) developed and operated by the U.S. Department of Defense provides an accurate current vehicle position using 3 to 4 satellites. The GPS system has a certain level of inaccuracy built in for security reasons. While the navigation system will compensate for this most of the time, occasional positioning errors up to 300 feet can and should be expected. Generally, position errors will be corrected within a few seconds. When your vehicle is not receiving signals from the satellites, the "GPS" mark does not appear at the screen. The GPS signal may be physically obstructed, leading to inaccurate vehicle position on the map display. Tunnels, tall buildings, 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 tinting 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 receiving good GPS signals, the vehicle position may not be shown accurately or inappropriate route guidance may occur in some cases. (a) Accurate current vehicle position may not be shown in the following cases: D When driving on a small angled Y- shaped road. D When driving on a spiral road. D When driving on a slippery road such as in sand, gravel, snow, etc. D When driving on a long straight road. D When freeway and surface streets run in parallel. D After moving by ferry or vehicle carrier. D When a long route is searched during high speed driving. D When driving without setting the current position calibration correctly. D After repeating a change of directions by going forward and backward, or turning on a turntable in the parking lot. D When leaving a covered parking lot or parking garage. D When a roof carrier is installed. D When driving with the tire chains installed. D When the tires are worn. D After replacing a tire or tires. 49 SSNU251

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Limitations of the Navigation System
49
This navigation system calculates the
current vehicle position using satellite
signals, various vehicle signals, map
data, etc. However, an accurate position
may not be shown depending on the sat-
ellite condition, road configuration, ve-
hicle condition or other circumstances.
The Global Positioning System (GPS) devel-
oped and operated by the U.S. Department
of Defense provides an accurate current ve-
hicle position using 3 to 4 satellites. The GPS
system has a certain level of inaccuracy built
in for security reasons. While the navigation
system will compensate for this most of the
time, occasional positioning errors up to 300
feet can and should be expected. Generally,
position errors will be corrected within a few
seconds.
SSNU251
When your vehicle is not receiving signals
from the satellites, the ”GPS” mark does not
appear at 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.
(a) Accurate current vehicle
position may not be shown in
the following cases:
D
When driving on a small angled Y–
shaped road.
D
When driving on a spiral road.
D
When driving on a slippery road such as
in sand, gravel, snow, etc.
D
When driving on a long straight road.
D
When freeway and surface streets run in
parallel.
D
After moving by ferry or vehicle carrier.
D
When a long route is searched during high
speed driving.
D
When driving without setting the current
position calibration correctly.
D
After repeating a change of directions by
going forward and backward, or turning
on a turntable in the parking lot.
D
When leaving a covered parking lot or
parking garage.
D
When a roof carrier is installed.
D
When driving with the tire chains installed.
D
When the tires are worn.
D
After replacing a tire or tires.