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With map matching
Without map matching
Positioning errors are kept to a minimum
by combining GPS, dead reckoning and
map matching. However, in some
situations, these functions may not work
properly, and the error may become
bigger.
•
GPS positioning is disabled if signals
cannot be received from more than two
GPS satellites.
•
In some driving conditions, signals from
GPS satellites may not reach your vehicle.
In this case, it is impossible for the system
to use GPS positioning.
In tunnels or enclosed parking garages
Under elevated roads or similar
structures
When driving among high buildings
When driving through a dense forest
or tall trees
•
If a car phone or mobile phone is used
near the GPS aerial, GPS reception may
be lost temporarily.
Handling large errors
When positioning by GPS is
impossible
•
Do not cover the GPS aerial with spray
paint or car wax, because this may block
the reception of GPS signals. Snow
buildup can also degrade the signals, so
keep the aerial clear.
NOTE
If a GPS signal has not been received for a
long time, your vehicle’s actual position
and the current position mark on the map
may diverge considerably or may not be
updated. In such case, once GPS reception
is restored, accuracy will be recovered.
Conditions likely to cause noticeable
positioning errors
For various reasons, such as the state of the
road you are travelling on and the
reception status of the GPS signal, the
actual position of your vehicle may differ
from the position displayed on the map
screen.
If you make a slight turn.
If there is a parallel road.
If there is another road very nearby,
such as in the case of an elevated
motorway.
If you take a recently opened road that
is not on the map.
If you drive in zigzags.
