Filter
Top Products
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 tunnels or en-
closed parking
garages
Under elevated
roads or similar
structures
When driving
among high build-
ings
When driving through
a dense forest or tall
trees
! If a car phone or cellular phone is used
near the GPS antenna, GPS reception may
be lost temporarily.
! Do not cover the GPS antenna 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
antenna clear.
p If, for any reason, GPS signals cannot be re-
ceived, learning and error correction are
not possible. If GPS positioning has been
operating for only a short time, your vehi-
cle’s actual position and the current loca-
tion mark on the map may diverge
considerably. Once GPS reception is re-
stored, accuracy will be recovered.
Vehicles that Cannot
Obtain Speed Pulse Data
p The speed pulse data comes from the
speed sensing circuit. The location of this
speed sensing circuit depends on your ve-
hicle model. In some cases, it is impossible
to make a connection to it, and in such a
case we recommend that ND-PG1 speed
pulse generator (sold separately) be
used.
Conditions Likely to Cause
Noticeable Positioning Errors
For various reasons such as the state of the
road you are traveling on and the state of re-
ception of the GPS signal, the actual position
of your vehicle may differ from the position
displayed on the map screen.
! If you make a shallow turn.
! If there is a parallel road.
Appendix
En
164
Appendix