Navigation mode, function

Data link connector (X11/4)

Instrument cluster (A1)

Multifunction steering wheel

GPS antenna
(A2/23)

Traction systems
control module
(N47)

Wheel speed sensor,
right front (L6/2)

Vehicle loudspeaker

Diagnosis

Radio tuner

Traffic data
memory (A2/43)

Central

processor

Audio
signal processing

Navigation processor with GPS receiver and gyro sensor

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

A2/5

CD drive

CAN
(A40/3-A1)

D2B

COMAND navigation system block diagram, without dynamic route guidance (code 815)

 The elements marked are the major components for the navigation mode.

Abbreviations:

A2/5 Antenna splitter (only with code 347) (emergency call system))

GPS Global positioning system

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 measures required to reach the destination are started (route guidance)

The navigation system is activated by pressing the button "NAVI" on the control module. A navigation processor with CD ROM drive for the digital map data is integrated into the COMAND operating, display and control module (A40/3) .

 Notes on navi-CD screen:
up to 31.05.01; "Please insert navi CD"
as of 01.06.01; "Please insert navi CD model DX"

This display is intended to ensure that customers procure the correct CD. The navigation CD-ROM drive can also play audio CD's.

Entering destination

Entry of the destination is accomplished with menu guidance on the control module

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and the entry is processed by the navigation processor. It is only possible to enter destinations which can be found on the CD ROM. COMAND offers the following possibilities for entering destinations:

 Direct entry on displayed map.

 Calling a destination stored in the system.

 Free entry of destination by using name (if destination is stored on CD-ROM).

Entering destination (as of 01.06.01)

Entry of the destination can be accomplished with menu guidance on the control module and the entry is processed by the navigation processor. COMAND offers the following possibilities for entering destinations:

 Address ...

 Destination memory

 Destinations via map ...

 Special destinations (e.g. railway stations, airports, etc.)

 Travel guides ...

 Last destinations ...

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Thinning speller (as of 01.06.01)

While entering the destination the letters still missing are supplemented from a present list. The thinning speller is only active in the political index and refers to the destination andstreet entry with route guidance The menuspecial destinations supports the submenus"Vicinity of other locations ..." and "Extraregional destinations..."The menu "Extraregional destinations ..." is subdivided into another submenu. The individual menu points in this submenu use the political index.

Dynamic supplementation feature

This function is realized for manual destination entry. While entering the destination the letters still missing are supplemented from a present list. The supplemented characters are indicated with a black background. Erasing is possible character for character.

Location finding

COMAND continuously calculates the vehicle location with

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the aid of the following procedures:

 GPSlocation finding

 Basic location finding (dead reckoning)

 Map-assisted location finding (map matching)

The navigation processor (A40/n2) calculates the most probable position by continuously comparing the position-finding results returned by these three methods.

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.

If the vehicle is equipped with dynamic guidance (code 815), the current traffic situation also influences the route calculation (e.g. construction site, traffic jam). The calculated route is stored in the navigation processor.

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Route guidance

After the navigation processor has calculated the route, route guidance is started.

Three types of depiction can be selected for graphic route guidance:

 Symbolic depiction (guidance symbol)

 Map depiction

 Combination of map depiction and symbolic depiction

Any of the three methods can be used. Route guidance is also supported by voice output via the vehicle loudspeakers.