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Navigation Mode, Function - GF82.85-D-2012AL

Model 907 

with code ZL3 (National version for Latin America) 

Block diagram 

G13791328

Function requirements, general 

IMPORTANT Explanations:

Secure Digital = SD, Global Navigation System = GPS, Universal Serial Bus = USB

Navigation mode 

The navigation module is integrated into the head unit. The navigation system includes the following functionalities:

The location of the vehicle and the direction and distance to the destination are determined continuously with the aid of the navigation system. After entering or selecting a destination location, route calculation starts.

If observance of the options is not possible, then the options set are ignored for the sections in question and a message is displayed and signaled audibly. The set options can be displayed and changed at any time. Once calculated, the route is displayed using arrow pictograms on the Audio/COMAND display and this information is also issued as an acoustic notification: "The route is being calculated". If the vehicle deviates from the route, the new route is re-calculated. If the recalculated values are plausible for the navigation system, then the modified route is displayed.

IMPORTANT Dynamic route guidance (with "Dynamic route", "Dynamic route with confirmation" or "Eco route"): An alternative route is offered under dynamic route guidance, in the event of a sufficiently long traffic jam or road closure on the calculated route.

If there is a valid subscription, the navigation system also includes apps with information (e.g. weather, fuel station prices) or lists and map data for points of interest (e.g restaurants, gas stations, parking areas, shopping), that can be selected as a destination or as a stopover.

IMPORTANT Destinations and routes can be sent from the Internet via the "Mercedes-Benz Application Gateway" to the vehicle and imported into the navigation system.

Destination entries or points of interest can be made available to the navigation module of the head unit by the Service Center. The navigation system can be operated with the following components:

IMPORTANT For the voice control system of navigation, in particular for destination entry, additional name lists are available in the navigation system. Name lists exist for the following information, for example, place names for selected towns/cities on the data storage medium, street names for all towns, town centers and special destinations.

The navigation mode function includes the following subfunctions:

IMPORTANT The navigation system uses a special interface to provide data that is used by other systems in the vehicle. The head unit transmits the data via the user interface CAN.

GPS position finding 

The GPS is a satellite-based position finding system, which is available on a global basis. GPS position finding is indispensable after vehicle transport (e.g. by train, ferry or after towing). Recalculating the GPS position (after interruption of the satellite reception) can take several minutes (up to 5 minutes during initial commissioning). The accuracy of the position finding and the actual calculation are essentially based on the measurement of the run times of the signals sent synchronously by the various satellites. A vital precondition is the synchronicity of the clocks in the satellites and in the receiver. To ensure synchronicity, the receiver is equipped with an automatic time correction that is possible thanks to the satellite signals.

Additional function requirements for GPS position finding 

GPS position finding function sequence 

The GPS receiver in the head unit receives the GPS signals from the GPS antenna. The head unit calculates the current position of the vehicle from the GPS signals. The direction of travel is determined with the aid of the sequence of locations calculated with the GPS system.

IMPORTANT Since GPS operates in the gigahertz range (GHz) and the signals are weak, reception interference can occur as a result of the following events:

Atmospheric interference (e.g. poor weather, water vapor, fog), multipath reception due to reflections of the signals (e.g. on building walls) or signal shadowing (e.g. in built-up areas, in tunnels, due to higher buildings or trees).

Basic position finding 

If no GPS signals are received during route guidance, navigation is still possible with basic position finding. A defect, e.g in the GPS antenna, is therefore not immediately noticeable. Basic position finding runs parallel to GPS position finding.

For basic position finding the head unit requires the following information:

IMPORTANT Rolling backward with "Tml. 15 OFF" or vehicle transportation falsify basic position finding. The deviation is automatically corrected by the navigation processor integrated in the head unit when GPS data is received.

Calibration 

The calibration following a tire replacement is performed automatically.

Recalibration 

Because of the tire abrasion, a constant recalibration of the tire circumference is required. Recalibration is carried out automatically and uses the difference between the calculated and actually traveled distance between two turning points that has been determined using map-based position finding.

Route calculation 

Route calculation is accomplished using the options set to the best possible extent. If observance of the options is not possible, they are ignored for the stretches in question. Visual and acoustic signals are also output. The set options can be changed at any time.

When the route is being calculated, the message "Calculating route" is output. Following calculation, the route is displayed by arrow pictograms on the Audio/COMAND display.

If the vehicle is no longer traveling along the precalculated route, the route is recalculated. As long as the recalculated values are plausible for the navigation system, the modified route is displayed.

Destination-oriented navigation 

The integrated navigation processor continuously compares the route calculation data with the position finding data and uses the data to deduce measures for further route guidance.

The route guidance is carried out by outputting visual and acoustic information and is divided up into the following areas:

Map route guidance 

Route guidance via a map is shown on the Audio/COMAND display or the instrument cluster.

The head unit transmits a switch-on request to the Audio/COMAND display control unit via the telematics CAN. At the same time, the head unit generates the signals for visualizing the route guidance (map navigation) and transmits them to the Audio/COMAND display control unit via the HSVL line and the corresponding picture signals to the instrument cluster.

Route guidance through driving lane recommendations 

For certain turnoff situations on multiple-lane exit points (e. g. freeway intersections), driving lane recommendations are shown in the bottom line. When a turnoff recommendation is given, the distance to the turnoff point is also displayed using a bar graph. The lanes have arrows assigned to them, which indicate on which lane the destination can be reached or the best way to reach it.

With day design, the following colors are used on the Audio/COMAND display:

Destination-oriented navigation through voice output 

Route guidance by means of voice output is an assistance function that assists the driver without distracting them from the traffic scene. Voice is output with the selected system language. The route guidance of the navigation system is supported by voice outputs with the following information:

Further voice messages take place, e. g. at the start of route calculation, when an intermediate destination has been reached, or when the destination has been reached.

During dynamic route guidance, additional voice messages are issued due to traffic messages affecting the route. In some cases, special information is also issued via voice output in certain circumstances, e. g.:

The navigation processor of the head unit links word segments to form complete instructions or information during voice output. The volume of the voice outputs can be adjusted during voice output using the instrument cluster multifunction steering wheel button group. The steering wheel electronics reads in the control signals of the instrument cluster multifunction steering wheel button group directly. The steering column tube module (MRM) control unit reads these in via the steering wheel CAN and sends them to the instrument cluster. The instrument cluster transmits the control signals of the instrument cluster multifunction steering wheel button group to the head unit via the user interface CAN.

Dynamic route guidance 

There are different types of dynamic route guidance:

During dynamic route guidance the current traffic situation is taken into consideration when appropriate traffic data is received. The traffic data recorder decodes the traffic information and forwards it internally to the navigation processor upon request. The navigation processor makes the decision whether the route should be changed.

During dynamic routing with confirmation, the user is notified of the effects of the route change on the travel distance and driving time. The route is only changed with the user's agreement.

In the "Eco route" mode a mixture of ecological and economic factors is taken into consideration for the route guidance along with the current traffic announcement.

If necessary, a message that the route should be changed is output via the speaker system.

Incoming information on the traffic situation can be received by the Radio Data System (RDS) and Traffic Message Channel (TMC) functions via FM radio or digital radio (DAB) if an appropriate station is set.

The FM receiver in the head unit forwards the traffic messages to the traffic data recorder in the head unit.

Vehicle Information and Communication System (VICS) via FM multiplexer 

The driver is provided with vital information by the VICS on the current traffic situation. Traffic impairments and traffic jams are shown on the map, however they are not incorporated into the dynamic route guidance. The VICS messages are transmitted as FM radio signals.

The VICS information is processed in the FM multiplexer integrated in the head unit. The head unit then transmits the data required for displaying the information to the Audio/COMAND display via the HSVL line.

Map function 

The map display is always controlled by the head unit. The following display functions are supported:

IMPORTANT In vehicles with a valid subscription, software updates can be downloaded online in the vehicle. If software updates are stored on mass storage devices for media, they can be transmitted to the head unit via the multimedia connection unit (A90/5).

Extended navigation functions 

The navigation system is extended with regard to convenience, customization and tourist information by the following functions:

Data communication between the head unit and the SD card takes place via the USB connection between the head unit and the multimedia connection unit.

The extended navigation mode functions are converted internally in the head unit and - where applicable - shown over the HSVL line on the Audio/COMAND display.

Function schematic for navigation mode PE82.85-D-2502-97TSA
Overview of system components of audio/navigation function GF82.85-D-9993AL 
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