Pioneer AVIC-D1 Owner's Manual - Page 113

NAVI/AV Appendix • 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. ❒ 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 vehicle's actual position and the current location mark on the map may diverge considerably. Once GPS reception is restored, accuracy will be recovered. • If there is a parallel road. • If there is another road very nearby, such as in the case of an elevated freeway. 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. • If you take a recently opened road that is not on the map. 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 drive in zig-zags. • If you make a shallow turn. • If the road has connected hairpin bends. 111