Position of Current Location Mark is Not Correct
- SELF-DIAGNOSIS Perform "Self-diagnosis mode" of the self-diagnosis function. Refer to , " «SELF-DIAGNOSIS MODE (NAVI)»(ref-239967-S00569823662006080300000) ". OK or NG OK: GO TO 2. NG: Check the malfunctioning parts.
- ERROR HISTORY DIAGNOSIS Was any error stored in , " «ERROR HISTORY»(ref-239967-S12038742952006080400000) " of the CONFIRMATION/ADJUSTMENT mode? YES or NO YES: , " «DIAGNOSIS BY ERROR HISTORY»(ref-239967-S32655489952006080400000) ". NO: , " «DRIVING TEST»(ref-239967-S26696855592006080400000) ".
EXAMPLES OF CURRENT-LOCATION MARK DISPLACEMENT
Vehicle's travel amount is calculated by reading its travel distance and turning angle. Therefore, if the vehicle is driven in the following manner, an error will occur in the vehicle's current location display. If correct location has not been restored after driving the vehicle for a while, perform location correction.
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CURRENT-LOCATION MARK DISPLACEMENT Cause (condition) -: While driving ooo: Display Driving condition Remarks (correction, etc.) Road configuration Y-intersections At a Y intersection or similar gradual division of roads, an error in the direction of travel deduced by the sensor may result in the current-location mark appearing on the wrong road. If after travelling about 10 km (6 miles) the correct location has not been restored, perform location correction and, if necessary, direction correction. Spiral roads When driving on a large, continuous spiral road (such as loop bridge), turning angle error is accumulated and the vehicle mark may deviate from the correct location. Straight roads When driving on a long, straight road and slow curve without stopping, map-matching does not work effectively enough and distance errors may accumulate. As a result, the vehicle mark may deviate from the correct location when the vehicle is turned at a corner. Zigzag roads When driving on a zigzag road, the map may be matched to other roads in the similar direction nearby at every turn, and the vehicle mark may deviate from the correct location. Roads laid out in a grid pattern When driving where roads are laid out in a grid pattern, or where many roads are running in the similar direction nearby, the map may be matched to them by mistake and the vehicle mark may deviate from the correct location. Parallel roads When two roads are running in parallel (such as highway and sideway), the map may be matched to the other road by mistake and the vehicle mark may deviate from the correct location. Place In a parking lot When driving in a parking lot, or other location where there are no roads on the map, matching may place the vehicle mark on a nearby road. When the vehicle returns to the road, the vehicle mark may have deviated from the correct location. When driving in circle or turning the steering wheel repeatedly, direction errors accumulate, and the vehicle mark may deviate from the correct location. If after travelling about 10 km (6 miles) the correct location has not been restored, perform location correction and, if necessary, direction correction. Turntable When the ignition switch is OFF, the navigation system cannot get the signal from the gyroscope (angular speed sensor). Therefore, the displayed direction may be wrong and the correct road may not be easily returned to after rotating the vehicle on a turntable with the ignition OFF. Slippery roads On snow, wet roads, gravel, or other roads where tires may slip easily, accumulated mileage errors may cause the vehicle mark to deviate from the correct road. Slopes When parking in sloped garages, when travelling on banked roads, or in other cases where the vehicle turns when tilted, an error in the turning angle will occur, and the vehicle mark may deviate from the road. Map data Road not displayed on the map screen When driving on new roads or other roads not displayed on the map screen, map matching does not function correctly and matches the location to a nearby road. When the vehicle returns to a road which is on the map, the vehicle mark may deviate from the correct road. Different road pattern (Changed due to repair) If the road pattern stored in the map data and the actual road pattern are different, map matching does not function correctly and matches the location to a nearby road. The vehicle mark may deviate from the correct road. Vehicle Use of tire chains When tire chains are used, the mileage is not correctly detected, and the vehicle mark may deviate from the correct road. Drive the vehicle for a while. If the distance still deviates, adjust it by using the distance adjustment function. (If the tire chain is removed, recover the original value.) Precautions for driving Just after the engine is started If the vehicle is driven just after the engine is started when the gyroscope (angular speed sensor) correction is not completed, the vehicle can lose its direction and may have deviated from the correct location. Wait for a short while before driving after starting the engine. Continuous driving without stopping When driving long distances without stopping, direction errors may accumulate, and the current-location mark may deviate from the correct road. Stop and adjust the orientation. Abusive driving Spinning the wheels or engaging in other kinds of abusive driving may result in the system being unable perform correct detection, and may cause the vehicle mark to deviate from the correct road. If after travelling about 10 km (6 miles) the correct location has not been restored, perform location correction and, if necessary, direction correction. How to correct location Position correction accuracy If the accuracy of location settings is poor, accuracy may be reduced when the correct road cannot be found, particularly in places where there are many roads. Enter in the road displayed on the screen with an accuracy of approx. 1mm. CAUTION: Whenever possible, use detailed map for the correction. Direction when location is corrected If the accuracy of location settings during correction is poor, accuracy may be reduced afterwards. Perform direction correction
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CURRENT-LOCATION MARK SHOWS A POSITION WHICH IS COMPLETELY WRONG
In the following cases, the current-location mark may appear on completely different position in the map depending on the GPS satellite signal receiving conditions. In this case, perform location correction and direction correction.
- When location correction has not been done If the receiving conditions of the GPS satellite signal is poor, if the current-location mark becomes out of place, it may move to a completely different location and not come back if location correction is not done. The position will be corrected if the GPS signal can be received.
- When the vehicle has traveled by ferry, or when the vehicle has been towed Because calculation of the current location cannot be done when travelling with the ignition OFF, for example when traveling by ferry or when being towed, the location before travel is displayed. If the precise location can be detected with GPS, the location will be corrected.
CURRENT-LOCATION MARK JUMPS
In the following cases, the current-location mark may appear to jump as a result of automatic correction of the current location.
- When map-matching has been done If the current location and the current-location mark are different when map-matching is done, the current location mark may seem to jump. At this time, the location may be "corrected" to the wrong road or to a location which is not on a road.
- When GPS location correction has been done If the current location and the current-location mark are different when the location is corrected using GPS measurements, the current-location mark may seem to jump. At this time, the location may be "corrected" to a location which is not on a road.
CURRENT-LOCATION MARK IS IN A RIVER OR SEA
The navigation system moves the current-location mark with no distinction between land and rivers or sea. If the location mark is somehow out of place, it may appear that the vehicle is driving in a river or the sea.
WHEN DRIVING ON SAME ROAD, SOMETIMES CURRENT-LOCATION MARK IS IN RIGHT PLACE AND SOMETIMES IT IS WRONG PLACE
The conditions of the GPS antenna (GPS data) and gyroscope (angular speed sensor) change gradually. Depending on the road traveled and the operation of the steering wheel, the location detection results will be different. Therefore, even on a road on which the location has never been wrong, conditions may cause the vehicle mark to deviate.
LOCATION CORRECTION BY MAP-MATCHING IS SLOW
- The map-matching function needs to refer to the data of the surrounding area. It is necessary to drive some distance for the function to work.
- Because map-matching operates on this principle, when there are many roads running in similar directions in the surrounding area, no matching determination may be made. The location may not be corrected until some special feature is found.
ALTHOUGH GPS RECEIVING DISPLAY IS GREEN, VEHICLE MARK DOES NOT RETURN TO CORRECT LOCATION
- The GPS accuracy has an error of approximately 10 m (30 ft). In some cases the current-location mark may not be on the correct street, even when GPS location-correction is done.
- The navigation system compares the results of GPS location detection with the results from map-matching location detection. The one which is determined to have higher accuracy is used.
- GPS location correction may not be performed when the vehicle is stopped.