Vehicles That Cannot Obtain Speed Pulse Data; Conditions Likely To Cause Noticeable Positioning Errors - Pioneer AVIC-X3II Operation Manual

Appendix
When driving
among high build-
ings
! If a car phone or mobile phone is used near
the GPS aerial, GPS reception may be lost
temporarily.
! 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.
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 travelling on and the state of re-
ception of the GPS signal, the actual position
When driving through
a dense forest or tall
trees
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.
Appendix
149
Engb