Pioneer AVIC-9DVD Owner's Manual - Page 135
Handling Large Errors, When the positioning by GPS is impossible
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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. sWhen 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 car. In this case, it is impossible for the system to use GPS positioning. 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 • If a car phone or cellular 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. ➲ If, for any reason, GPS signals cannot be received, learning and error correction are not possible. If GPS positioning has been operating for only a short time, your car's actual position and the current location mark on the map may diverge considerably. Once GPS reception is restored, accuracy will be recovered. Appendix 133