Examples of Current-Location Mark Displacement

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.

CURRENT-LOCATION MARK SHOWS A POSITION THAT IS COMPLETELY INCORRECT
In the following cases, the current-location mark may appear in a completely different position on the map depending on the GPS satellite signal receiving conditions. In this case, correct both current-location and direction.

- When current-location is not corrected
- If GPS satellite reception is poor and the current-location mark slips out of place, it may shift to a completely unexpected location and not return unless location correction is performed. The position will be corrected if a GPS signal can be received.

- When moving by ferry or in tow
- When moving vehicle with the ignition switch OFF by ferry or in tow, a location before moving is displayed because current-location is not calculated. The new location is corrected after detecting a correct location with GPS.

CURRENT-POSITION 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 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 current location and the current-location mark are different when 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 THE 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.

CURRENT-LOCATION MARK AUTOMATICALLY ROTATES
The system wrongly memorizes the rotating status as stopping when the ignition switch is turned ON with the turntable rotating. That causes the current-location mark to rotate when the vehicle is stopped.

WHEN DRIVING ON THE SAME ROAD, SOMETIMES THE CURRENT-LOCATION MARK IS IN THE CORRECT PLACE AND SOMETIMES IT IS THE INCORRECT PLACE
The conditions of the GPS antenna (GPS data) and gyroscope (angular speed sensor) change gradually. Depending on the road traveled and operation of the steering wheel, the location detection results will be different. Therefore, even on a road on which the location has never been incorrect, 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 of the way map-matching operates, when there are many roads running in similar directions in the surrounding area a matching determination may be impossible. The location will remain uncorrected until some special feature is found.

ALTHOUGH GPS RECEIVING DISPLAY IS GREEN, THE VEHICLE MARK DOES NOT RETURN TO THE CORRECT LOCATION
- The GPS accuracy has an error of about 100 m (300 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 that is determined to have higher accuracy is used.
- Position correction by GPS is not available while the vehicle is stopped.

NAME OF CURRENT-LOCATION IS NOT DISPLAYED
The current-locations information may not be displayed if there are no place names displayed on the map screen.