Lexus ES 300 Owner's Manual page 61

Limitations of the Navigation System
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.
ES300_Navi_U (L/O 0208)
(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.
2003 ES300 Navigation from Aug. '02 Prod. (OM33592U)
D After replacing a tire or tires.
D When using tires that are smaller or larger
than the factory specifications.
D 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 75.
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