Pioneer AVIC-90DVD Owner's Manual - Page 178
Conditions likely to cause noticeable positioning errors
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■Conditions likely to cause noticeable positioning errors Certain conditions are more likely to cause discrepancies between your actual position and the location shown on the map display. • 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 • If you take a recently opened road that is not on the map • If you drive in zig-zags • If the road has connected hairpin bends • If there is a loop or similar road configuration • If you take a ferry • If you are driving on a long, straight road or a gently curving road • If you are on a steep mountain road with many height changes • If you enter or exit a multi-storey parking lot or similar using a spiral ramp • If your car is turned on a turntable or similar • If your car's wheels spin, such as on a gravel road or in snow • If you put on chains, or change your tires for some of a different size • If trees or other obstacles block the GPS signals for a considerable period • If you drive very slowly, or in a start-and-stop manner, as in a traffic jam • If you join the road after driving around a large parking lot • When you pass around a traffic circle • When starting driving immediately after starting the engine • If you insert the disc and turn your Navigation System on while driving Some types of car may not output a speed signal while driving at just a few miles (kilometers) per hour. In such a case, the mark indicating your car's current location may not be displayed correctly while in a traffic jam or in a parking lot. 176