The receiver of the GPS satellite navigation system supplies the navigation computer with the current position of the vehicles in degrees latitude and longitude.
A DVD with map data is loaded in the DVD drive of the navigation computer. The navigation computer combines the vehicle position calculated by the GPS with this map data.
The current position is shown on the map indicated by the on-board monitor.
The driver can enter a destination. The navigation computer calculates a route from the current location to this destination based on selectable criteria (via motorway, no motorway).The calculated route is shown in the route display.
With the aid of arrow indicators and distance data on the on-board monitor and a voice output function, the navigation computer indicates how and where to get into the correct lane or turn off while the vehicle is moving.
The navigation computer calculates the distance covered from the DSC DFAHVL signal.
A angular velocity meter, known as the ”GYRO”, informs the navigation computer about rotary movements of the vehicle (e.g. when turning off etc.). This gyro is fitted in the casing of the navigation computer.
An alternative route is recalculated automatically if the driver does not follow the route instructions.
A DVD drive is integrated in the navigation computer. The map DVD is to be loaded in this drive.
The gyro is designed as an angular velocity meter which records the forces which occur during a change in direction and transfers this data to the navigation computer in the form of a voltage change. This gyro is fitted in the casing of the navigation computer.
The Global Positioning System is a system which was originally developed for military use, in which approx. 20 satellites in earth orbit send position-related signals. These signals are evaluated by a computer specially developed for this purpose and converted into a position. The accuracy of the system varies, however, it is at least within 100 m.
GPS reception is only possible when unobstructed view of the sky is ensured.
GPS, in conjunction with the BMW navigation system, consists of an aerial and a receiver which evaluates the satellite data received via the aerial and transfers the calculated vehicle position to the navigation computer.
In navigation mode, the letters ”GPS” are shown in the top right corner of the map display, indicating that the GPS receiver is in standby mode.
GPS reception is indicated by line symbols.
The number of coloured lines in the symbol corresponds to the GPS reception status.
Lines |
Definition |
1 |
Satellite reception |
2 |
2D-position (degrees longitude and latitude) |
3 |
3D-position (degrees longitude and latitude and altitude) |
The communication interface for all components of the Japan navigation is the I bus. All of the data exchange, including diagnosis, takes place across this bus, whereby the FBI (Flexible Bus Interface) functions as Gateway to the MOST bus.
The navigation computer evaluates the DSC DFAHVL signal in order to determine the distance covered.
The data which the navigation computer requires for route planning is stored on the map DVD. It is advisable to use the latest updated version in order to take account of any changes in the road system.
The sound signals are transferred across 2 NF cables to the FBI (Flexible Bus Interface).
The image signals are transferred via RGB lines to the video module.
VICS data are received by the VICS receiver and transferred to the navigation computer.
Important
After the navigation computer has been replaced, a test drive lasting approx. 5 minutes is necessary, during which GPS reception must be ensured.
A new version of the operating software offered by BMW should be loaded as follows (refer also to instructions on the CD):
Important
Do not change the terminal setting during the loading procedure! Ensure adequate voltage in the vehicle electrical system.