Navigation mode, function

Navigation computer with

GPS receiver and

rotation-rate sensor (gyrosensor)

Traffic data

memory

Central

computer

Audio signal

processing

CD drive

Diagnosis

Radio tuner

COMAND operating, display and control module (A40/3)

Sound amplifier

(A2/13)

Diagnostic connector (X11/4)

D2B

CD player
with changer
(in trunk) (A2/6)

D2B

D2B

AF signals

CTEL
interface (A34/4)

D2B

CTEL and GPS roof antenna
(A2/49)

Traction systems
control module
(N47)

Antenna splitter

CTEL and GPS
(A2/57)

A34/6

A34/7

GPS

Microphone

(B25/6)

Microphone

(B25)

Rpm sensor

right front (L6/2)

Vehicle loudspeaker

Block diagram for COMAND navigation system, illustrated with

 CD changer (code 819)

 Sound system (code 810)

 without dynamic navigation (code 815)

B25 Hands-free conversation equipment microphone

B25/6 Sound amplifier microphone

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

Abbreviations

GPS Global Positioning System

D2B Digital Data Bus

AF Audio frequency (20 Hz... 20 kHz)

A34/6 Portable cellular telephone

A34/7 CTEL bracket

Function

The navigation system is integrated into the COMAND operating, display and control module (A40/3). The location of the vehicle and the direction to and distance from the destination (according to specified destination) are determined with the aid of this system. Afterwards the required measures for reaching the destination are initiated (destination finding).

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

A navigation processor with CD drive for the digital map data is integrated in the COMAND operating, display and control module (A40/3).

 The navigation CD drive can also play audio CDs.

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 Note in Navi-CD screen:
"Please insert Navi-CD type DX"

Destination entry

Destination input is performed menu-guided on the operating unit and processed by the navigation processor. Only destinations that are also on the CD-ROM may be entered. The COMAND operating, display and control module (A40/3) provides the following destination input capabilities:

 Address...

 Destination memory...

 Destination using map...

 Special destinations (e.g. railway station, airport etc.)

 Travel guide...

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 Intermediate destination entry

 Destination memory with individual destination designation capabilities

 Final destination ...

 Dynamic route calculation by:
- Blocking of route sections (traffic-jam function)
- Traffic-jam ahead
- Blocking in route list

 Incorporation of traffic information of an external service provider via telephone TCS (once, cyclic every t = 15 min.). Chargeable services.

 Incorporation of traffic information via RDS broadcast (TMC), free of charge

Predictive speller (editor)

During the entry of the destination the missing letters are augmented for an available list. This is only active in the political index and relates to the destination and road entry as part of the destination finding. In the menu Special destinations the submenus "Bypassing other locations..." and "National destinations..." are assisted.

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The "Supraregional destination..." menu is divided up into additional submenues. The individual menu points in this submenu use the political index.

Dynamic addition

implemented during manual entry of the destination. During the entry of the destination the missing letters are augmented for an available list. The added letters are highlighted in black. Deleting is done one character at a time.

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

 GPS position finding

 Basic position finding (compound position finding)

 Map-supported position finding (map matching)

The navigation computer calculates the most probable position by continuously comparing the position-finding results returned by these three methods.

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Route calculation

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

In the dynamic destination-finding system the route calculation is automatically influenced by the incorporation of traffic information, free of charge via RDS, TMC or over an external provider TCS by telephone (chargeable).

The calculated route is stored in the navigation processor.

Destination-finding system

Destination finding is started once the navigation computer has performed the destination calculation.

Three display options are available for graphical representation of the destination-finding system:

1. with map

2. with map and symbol display before turn-off point
--> MIX mode

3. with symbol display only (route guidance symbols)

Any of the three methods can be used. The destination-finding system is also supported by voice output from the vehicle loudspeakers.