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Appendix
case, it is impossible for the system to use GPS
positioning.
• If a vehicle 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 vehicle wax, because this may block the
reception of GPS signals. Snow buildup can
also degrade the signals, so keep the antenna
clear.
❒ If, for any reason, GPS signals cannot be
received, learning and error correction are not
possible. If GPS positioning has been operat-
ing for only a short time, your vehicle’s actual
position and the current location mark on the
map may diverge considerably. Once GPS
reception is restored, accuracy will be recov-
ered.
Vehicles that Cannot Obtain
Speed Pulse Data
❒ The speed pulse data comes from the speed
sensing circuit. The location of this speed
sensing circuit depends on your vehicle
model. In some cases, it is impossible to
make a connection to it, and in such a case
we recommend that the 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 reception 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.
• If there is another road very nearby, such as in
the case of an elevated freeway.
In tunnels or enclosed parking garages
Under elevated roads or similar
When driving among high buildings
When driving through a dense forest or tall trees