Navigation 99
General Information■Accuracy of vehicle positionArea in which GPS signals cannot be receivedBecause the radiowave signals from the GPS satellites travel primarily
by line of sight, the navigation system might not be able to receiv e
the signals in the areas described below.(If the GPS mark does not
appear on the map screen, it mean s that the GPS radiowave signals
are not being properly received.)
(1) Inside a tunnel
(2) Inside a building
(3) Under a three-dimensional road system such as for high spee d
roads
(4) On boulevards lined with trees
(5) Between buildings
(6) Under a cliff or in a cave • If the GPS antenna or its surroundings are blocked by an obstac le
(including cargo), it might not be possible for the system to
receive the GPS radiowave signals.
• If multiple paths are created due to the reflection from buildings,
a large measurement error could occur, causing the vehicle's
mark to deviate from its actual position.
Deviation of the vehicle's position markThe vehicle's position mark could deviate from its actual position
when the vehicle is being driven under the conditions listed below or
due to conditions of the GPS satellites.
If the vehicle travels on a road whose actual shape differs from that in
the map data, the vehicle's mark co uld deviate from the actual posi- tion. The correct position will even
tually appear on the screen
through the correction function. If the screen does not show the cor-
rect position for an excessively long time, correct the current posi tion
or make an automatic correction.
(1) The vehicle's mark could appear on a parallel road.
(2) When the road splits into a narrow Y, the vehicle's mark could
appear on the other fork of the Y.
(3) When the vehicle makes a right or left turn, the vehicle' s mark
could appear on one street ahead or behind.
(4) If the vehicle is transported by means other than the vehi cle's
own power, such as on a ferryboat, the vehicle's mark will
remain in the position it was before the transport until the sys-
tem can calculate the position through the GPS.
(5) When the vehicle is driven on a steep incline, the vehicle' s mark
could deviate from its actual position.
(6) If there are continuous gradual curves in the same directi on, the
vehicle's mark could deviate from its actual position.
(7) If the vehicle is driven in a zigzag pattern, such as through fr e-
quent lane changes, the vehicle' s mark could deviate from its
actual position.
(8) If the vehicle is placed on a tu rntable, such as in a parking area,
and turned with the ignition OFF, the vehicle's mark could devi-
ate from its actual orientation. The vehicle's mark could also
deviate even after the vehicle has exited the parking area.
(9) The vehicle's mark could deviate from its actual position if the
vehicle is driven using tire chains or snow tires on a snow-cov-
ered road or on a mountainous road.
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Navigation 101
General Information
(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 ind i-
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.
(10) The system might guide the driver to make a U-turn.
(11) The system might guide the driv er 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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