Navigation mode, function

Data link connector
(X11/4)

D2B interface
portable cellular telephone

Portable cellular telephone

CD player
with changer

CTEL antenna
(A2/49a1)

D2B

Traction system control module (N47)

GPS antenna
(A2/49a2)

Navigation processor with
gyrosensor
and GPS receiver

Diagnosis

Radio tuner

Traffic data
memory

Central
processor

Audio
signal processing

CD drive

COMAND operating, display and control module



(A40/3)

Vehicle loudspeaker

Microphone

Hands-free system

Antenna

amplifier

(A2/18)

Antenna

Rear spoiler

(A2/51)

COMAND navigation system block diagram, illustrated without dynamic destination guidance

The marked components are the main ones involved in navigation operation .

The location of the vehicle and the direction to and distance from the destination (according to specified destination) are determined with the aid of the COMAND navigation system. Then the measuress required to reach the destination are started (guidance).

The navigation system is activated by pressing the "NAVI" button on the operating module.

In the COMAND operating, display and control module (A40/3) there is an integrated navigation processor with CD-ROM drive for digital map data.

 The navigation CD-ROM drive can also play audio CDs.

Destination entry

Destination entry is accomplished with menu guidance on the operating module and is processed by the navigation processor. Only destinations can be entered which are stored on the CD-ROM. COMAND offers the following possibilities for entering destinations:

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 Direct entry on the map displayed.

 Calling a destination stored in the system.

 Free entry of the destination using its name (when the destination is stored on the CD-ROM).

Location finding
COMAND continuously calculates the location of the vehicle with the aid of the following procedures:

 GPS location finding

 Basic location finding (dead reckoning)

 Map matching location finding

The navigation processor calculates the most probable position by continuously comparing the location finding results of these three procedures.

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Route calculation

The route is calculated by the navigation processor in accordance with the specified destination, or automatically, after a deviation from the suggested route has taken place.

When the vehicle is equipped with dynamic guidance in addition, the current traffic situation (road construction, traffic jams, ...) also automatically affects the route calculation.

The calculated route is stored in the navigation processor.

Guidance
After the navigation processor has completed route calculation, guidance is started.

Three types of display can be selected for graphic guidance:

 Symbolic display (path guidance symbols)

 Map display

 Combination of map display and symbolic display

Any of the three methods can be used. In all cases, guidance is supported significantly by voice output over the vehicle loudspeakers.