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p If ND-PG1 is used or if your vehicle is oper-
ating in Simple hybrid mode, the distance
calculation value cannot be replaced auto-
matically.
Map matching
As mentioned, the GPS and dead reckoning
systems used by this navigation system are
susceptible to certain errors. Their calcula-
tions may, on occasion, place you in a location
on the map where no road exists. In this situa-
tion, the processing system understands that
vehicles travel only on roads, and can correct
your position by adjusting it to a nearby road.
This is called map matching.
With mapmatching
Without mapmatching
Handling Large Errors
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.
When the positioning by GPS is
impossible
! If signals cannot be received from more
than two GPS satellites, GPS positioning
does not take place.
! 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 tunnelsor enclosed parking garages
Under elevatedroads or similarstruc-
tures
When driving among high buildings
When driving through a denseforest or
tall trees
! If a car phone or cellular phone is used
near the GPS antenna, GPS reception may
be lost temporarily.
Appendix
En
193
Appendix
Appendix