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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. 
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. 
 Route computation, 
function GF82.61-P-3011GH
 Constant map matching, 
function GF82.61-P-2002GH
 Basic location finding, 
function GF82.61-P-3006GH
 Destination-finding 
system, function GF82.61-P-3012GH
 Destination finding in  GF82.61-P-4000GH
 
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1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis  
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NAVIGATION MODE, FUNCTION - GF82.85-P-2012GI 
MODEL 163 as of 1.9.01 with CODE (522) Modular control system (MCS) radio USA with CODE (357) 
Navigation system - additional unit with CODE (818b) Single CD player - additional unit with CODE 
(491) U.S. version  
Fig. 89: Identifying MCS Navigation System Block Diagram
 
Function  
The navigation system (optional) is integrated into the radio and navigation module (A2/56) . 
With this system the vehicle location and the direction and distance to destination (after entering destination) 
are determined. Then the required measures are taken to reach the destination (guidance ) . 
digitized map area, 
function
 Destination finding in 
non-digitized map area, 
function GF82.61-P-4001GH
 Volume/tone 
adjustments, function GF82.60-P-2003GH
 Global positioning 
system location finding, 
function GF82.61-P-3007GH
 
2001 Mercedes-Benz ML320 
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis  
me  
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The navigation system can be activated by pressing the" NAVI" button on the control module.
A navigation processor with CD drive for the digital map data is integrated (optional) into the radio and 
navigation module (A2/56) 
 The navigation CD drive can also play audio CD's . 
Destination entry  
The destination can be entered with menu-guidance on the control module and is processed by the navigation 
processor . It is only possible to enter destinations which are stored on the CD-ROM . 
Location finding  
the radio and navigation module (A2/56) continuously calculates the vehicle location with the aid of the 
following procedures: 
GPS location finding  
Basic location finding (dead reckoning)  
Map-supported location finding (map matching)  
The navigation processor calculates the most probable position by permanently comparing the location results 
of these three methods. 
Route calculation  
The route calculation is accomplished in the navigation processor after the destination is entered or 
automatically following a deviation from the suggested route. 
The calculated route is stored in the navigation processor . 
Route guidance  
After the navigation processor has calculated the route guidance starts. 
Route guidance is accomplished graphically with a digital map with direction arrows as well as with the aid of 
the voice output on the vehicle loudspeakers. When the " NAVI VOICE " button is pressed the last current 
navigation command is repeated. The volume of the voice output can be set on the volume knob during a 
navigation command. The following functions are available in the navigation mode: 
When the" NAVI MENU " button is actuated the main navigation menu opens. 
All other entries can be made with the " joystick ". 
"Dest" (destination entry)radio and navigation module (A2/56) offers the following possibilities for 
destination entr
y: 
 
2001 Mercedes-Benz ML320 
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis  
me  
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Address  
Junction (intersection)  
Selecting hotel, church or point of interest  
Direct entry on map (map cursor)  
Calling up stored destination (recent route)  
Address book  
Selection of address in date book (today's plan)  
After selecting one of these possibilities, e.g. address, it is possible to proceed with the entry of additionally 
required information. Incorrect entries can be erased with " Delete " Spaces can be entered with " Space ". 
After completely entering the information confirm by pressing the "joystick " (Ent). 
"OK to proceed " starts calculation of the route. 
Setup (settings) 
Various settings for the screen display and route guidance can be made with this menu. 
Option (selection) 
With this menu information, e.g. location, can be called up. 
Entries in address book, in date book or in list of last driven routes can be processed by selecting 
correspondingly. 
Route 
This menu provides settings influencing the current route guidance. 
 This menu can only be called up during route guidance. 
Detour multifunction key 
Pressing the multifunction key" DETR " causes the navigation processor to calculate the closest possible 
alternative route, e.g. in the case of traffic jams, constructions sites, etc. 
STOP multifunction key 
Route guidance can be terminated by pressing multifunction key" STOP ". 
LIST multifunction key 
Pressin
g multifunction key" LIST " calls up a list of roads to be driven in the current route guidance.
 
2001 Mercedes-Benz ML320 
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis  
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MUTE multifunction key 
Muting voice output. 
MAP multifunction key 
Changing between map display and direction arrow display 
 Pressing the "Clear " key returns to the previous menu. 
STARGUIDE, FUNCTION - GF82.85-P-2014GI 
MODEL 163 as of 1.9.01 with CODE (522) Modular control system (MCS) radio USA with CODE (357) 
Navigation system - additional unit with CODE (818b) Single CD player - additional unit with CODE 
(491) U.S. version  
The StarGuide system uses the availability of the present technologies for telecommunications. 
These are used for the purpose of personal information services. 
 The service "Dynamic route guidance " will be added to the system at a later time. 
Technical requirements:  
E-Call and  
MCS and  
newest navigation CD (it includes the current software for executing the offered services). The MCS is 
updated with this and  
the prerequisites required for executing the corresponding systems are fulfilled.  
Organizational prerequisites:  
 Constant map 
matching, 
function GF82.61-P-
2002GI
 Route 
calculation, 
function GF82.61-P-
3011GI
 Guidance, 
function GF82.61-P-
3012GI
 Voice output, 
function GF82.85-P-
3001GI
 Volume/tone 
adjustments, 
function GF82.60-P-
2003GI
 
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1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis  
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GPS G lobal P ositioning S ystem. Satellite-supported system for precise positioning and navigation. At 
present 26 satellites are in operation orbiting the earth on 6 orbits.  
AMPS: A dvanced M obile P hone S ystem. The AMPS network is now available to 98% of the 
population in the most densely-populated areas of the USA .  
SOC: S ervice O perating Center. The SOC takes over all individual requirements of the driver and 
transmits the corresponding information to the vehicle.  
Concept of personal information service:  
Individual information and news transmission according to personal interest profile (stock exchange, 
weather, sport...)  
Transmitting a request via a button (SVC button) to the S ervice O perating C enter (SOC )  
e S ervice O perating C enter (SOC ) transmits the customer profile corresponding to the individual 
information and news.  
The data transmitted is indicated on the display of the radio and navigation module (A2/56) and can 
then be read. 
VOICE OUTPUT, FUNCTION - GF82.85-P-3001GI 
MODEL 163 as of 1.9.01 with CODE (522) Modular control system (MCS) radio USA with CODE (357) 
Navigation system - additional unit with CODE (818b) Single CD player - additional unit with CODE 
(491) U.S. version  
 Information 
service, 
function GF82.85-P-
3016GI
 Data 
transmission 
for Starguide, 
function GF82.85-P-
3017GI
 
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Fig. 90: MCS Voice Output Block Diagram 
The navigation system guidance feature is supported significantly by voice output . 
The voice data was originally stored as single-word segments on the navigation CD-ROM . This data set is 
transmitted automatically by the CD-ROM to the navigation processor and stored there. 
The navigation processor interlinks these word segments to complete instructions or information and generates 
corresponding AF signals. The generated AF signals are transmitted internally in the radio and navigation 
module (A2/56) to the audio signal processing if required, amplified there and output via the vehicle 
loudspeakers. 
With the sound system (code 810) the voice signals are transmitted to the sound amplifier (A2/13) from the 
audio signal processing via the digital data bus ( D2B ), amplified there, and then output via the vehicle 
loudspeakers. 
 Several short, sequential drive recommendations are compiled to one single voice output. 
Loading voice from CD-ROM  
Only English is presently available for voice output on the radio and navigation module (A2/56) . 
Volume of voice output  
The voice output volume can be adjusted during voice output . This ensures that a defined interval is 
maintained between the volume of the current audio source and voice output. 
Example:  
If the volume is reduced during voice output and the preceding volume interval to the audio signal is not 
reached the radio and navigation module (A2/56)
 
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reduces the level of the audio signal until the specified volume interval is reached again. The volume of the 
audio signal is then again increased after completion of the voice output to the level present before the voice 
output. 
Moreover, the volume of the voice output cannot be reduced below a certain minimum level . 
Voice output mute circuit  
Navigation voice output can be muted by actuating the mute multifunction key. Muting remains active until the 
mute multifunction key is pressed again. 
INFORMATION SERVICE, FUNCTION - GF82.85-P-3016GI 
MODEL 163 as of 1.9.01 with CODE (522) Modular control system (MCS) radio USA with CODE (357) 
Navigation system - additional unit with CODE (818b) Single CD player - additional unit with CODE 
(491) U.S. version  
Fig. 91: Service Request Display Using SVC Button (Example)
 
Service request procedure  
It is possible to change to the service mode with the button " SVC" on the radio and navigation module 
 Navigation mode, function GF82.85-P-2012GI
 Radio and navigation 
module, location/purpose/ 
design/function GF82.61-P-4109GI
 
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1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis  
me  
Saturday, October 02, 2010 3:30:06 PMPage 153 © 2006 Mitchell Repair Information Company, LLC.