Appendix
Appendix
When the positioning by GPS is | Vehicles that Cannot |
impossible | Obtain Speed Pulse Data |
!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.
pThe 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
pulse generator (sold separately) be used. 
Conditions Likely to Cause Noticeable Positioning Errors
In tunnels or en- | Under elevated |
closed parking | roads or similar |
garages | structures |
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.
When driving | When driving through |
among high build- | a dense forest or tall |
ings | 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.
pIf, 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. 
!If there is a parallel road.
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