The position of the car on the map is wrong
The navigation system shows the position of the car to an accuracy of about 20 metres (65 ft).
There is a greater risk of error when driving on roads lying parallel to another road, on winding roads, on roads with several levels and after driving a long distance without making any distinctive turns.
High mountains, buildings, tunnels, viaducts, over/underpasses etc. also have a negative effect on the reception of satellite signals, which means that accuracy in calculating the position of the car may decrease.
The system does not always calculate the fastest/shortest route
When calculating a route, several factors are taken into account to determine the theoretically best solution. Factors include route distance, road width, road classification, traffic intensity and speed limits. However, an experienced driver with local knowledge can quite possibly select a better route.
The system may for example use toll roads or ferries while the driver has chosen to avoid them
For technical reasons, the system can only use larger roads when calculating a route extending over a long distance.
If you selected to avoid toll roads and motorways, then they are avoided to the greatest possible extent and are only used if there is no other reasonable alternative available.
The position of the car on the map is incorrect after transportation
If the car is transported, for example by ferry or train, or in such a way as to impede the reception of satellite signals, it can take up to 5 minutes before the position of the car is correctly calculated.
The car symbol on the screen behaves illogically after the tyres have been changed
In addition to the satellite receiver, the car's speed sensor and a gyroscope assist in calculating the current position, speed and direction of travel of the car. After fitting the spare wheel or changing between summer and winter tyres the system needs to "learn" the size of the new wheels.
In order that the system shall function optimally it is therefore recommended that the car is driven for a while on roads with good satellite reception (good visibility).
The map image does not correspond with the real situation
Factors such as the constant expansion and rebuilding of the road network, new traffic regulations constantly being introduced etc. mean that the map database is not always, in every situation, complete.
Because of this the map data is being constantly developed and updated - check now and again to see if there are any updates.
The car symbol on screen jumps forwards or spins
The system may need a few seconds to sense the position and movement of the car before driving off.
Switch off both the system and the engine. Start again, but remain stationary for a while before starting to drive.
The map information is not up to date
See the answer under the next heading.
Is the latest map information installed?
Map data are updated and improved continuously. In connection with map updates via computer and USB, the current map version in the car can be shown. Check the map version in the car and compare with the available map version in the support information on www.volvocars.com.