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Navigation Mode, Function - GF82.85-P-2012RFN

Model 253 (except 253.99) 

as of model year 2020 

with code 355 (Extended MBUX functions) 

Model 253 (except 253.99) 

as of model year 2020 

with code 365 (Hard drive navigation) 

Model 253 (except 253.99) 

as of model year 2020 

with code U19 (Augmented reality video) 

G12824497Courtesy of MERCEDES-BENZ USA

Function requirements, general 

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.

Depending on national version, various options can be selected for route calculation, e.g.:

IMPORTANT Dynamic route guidance: An alternative route is offered under dynamic route guidance, if the calculated route has a significant traffic jam or road closure on it.

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.

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. If the recalculated values are plausible for the navigation system, then the modified route is displayed.

IMPORTANT The navigation map can also be configured on the head unit to be shown on the instrument cluster. The head unit sends the map data over an HSVL line to the instrument cluster.

In the case of a valid subscription, the navigation system also includes apps with information (e.g. weather, gas station prices), or lists, map data for points of interest (e.g restaurant, gas station, parking area, shopping), that can be selected as a destination or for a stopover.

IMPORTANT Destinations and, where applicable, routes can be sent from the Internet to the vehicle and imported into the navigation system. Destination entries or points of interest can also be provided by the Service Center.

The navigation system can be operated with the following components:

IMPORTANT Additional name lists are available in the navigation system for navigation VCS, in particular for entering the destination. 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:

GPS position finding 

The GPS is a satellite-based position finding system, which is available on a global basis. GPS position finding is irretrievable after vehicle transport (e.g. by train or 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.

The GPS receiver in the head unit receives the GPS signals from one of the following components:

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 As GPS operates in the gigahertz range and the signals are weak, the following events may lead to reception interference: Atmospheric interference (e.g. bad weather, water vapor, fog), multiple reception through signal reflexions (e.g. on building walls), or signal shadowing (e.g. in built-up areas, in tunnels, in the vicinity of tall buildings of 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 perceptible. Basic position finding runs parallel to GPS position finding.

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

IMPORTANT Location faults during position finding, rolling backward with circuit 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.

IMPORTANTCalibration 

The calibration following a tire replacement is performed automatically. 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. Once the route has been calculated, it is then shown with the aid of arrow pictograms. If the vehicle is no longer traveling along the precalculated route, the route is recalculated. If the recalculated values are plausible for the navigation system, then 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.

Various map types and directions are available for selection.

The head unit transmits a switch-on request to the Audio/COMAND display via the telematics CAN. At the same time, the head unit generates the signals for visually depicting route guidance (map navigation), and transmits these to the Audio/COMAND display via the HSVL line.

IMPORTANT With code 362 (HERMES LTE):

On vehicles with a valid subscription, the map data updates can be downloaded online in the vehicle. If map data updates are stored on USB (Universal Serial Bus) mass storage devices, they can be transferred to the head unit through the multimedia connection unit (A905).

Route guidance through driving lane recommendations 

For certain turnoff situations on multiple-lane departures (e.g. freeway intersection), 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:

White arrow, highlighted in blue: Best or recommended lane

White arrow without blue background: Lane is correct, but a lane change will soon be required.

Gray arrow: Lane does not lead to the required destination.

Lane recommendations can also be shown on the instrument cluster. The head unit sens the signals over an HSVL line to the instrument cluster.

IMPORTANT With code 463 (Head-up display):

Lane recommendations can also be shown on the head-up display (A40/12). It is actuated on the instrument cluster.

Route guidance by means of voice output 

Route guidance by means of voice output is an assistance function that assists the driver without distracting him from the traffic. Voice is output with the selected system language. The navigation system route guidance is supported by voice output e.g. 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 settings in the head unit determine which messages are then displayed.

The navigation processor of the head unit links word segments to form complete instructions or information during voice output.

In vehicles without CODE 810 (Sound system), the voice output is relayed to the speaker system by the head unit.

In vehicles with CODE 810 (Sound system), the head unit transmits the voice output via the MOST to the sound system amplifier control unit. The sound system amplifier control unit amplifies the signals and forwards them to the speaker system.

The volume of the voice outputs can be adjusted using a menu in the head unit. If, during a voice output, the volume adjustment button (manual transmission) on the left lower control panel, the volume control button (automatic transmission) on the right lower control panel or the volume adjustment switch on the head unit multifunction steering wheel button group is pressed, the voice outputs are switched off. Voice outputs can be switched on again using a button in the navigation menu. The left lower control panel sends the status of the volume adjustment button (manual transmission), or the right lower control panel sends the status of the volume control button (automatic transmission) over the LCP-LIN, touchpad and the telematics CAN to the head unit.

The steering wheel electronics reads in the control signals of the head unit multifunction steering wheel button group directly. The steering column tube module control unit reads them in over the steering-wheel CAN and sends them to the head unit over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN.

Route guidance with augmented reality (with code U19 (Augmented reality)) 

During route guidance with augmented reality, the Audio/COMAND display shows a video image from the driver's perspective and enriches it with additional information from the navigation system.

The augmented reality camera in front of the inside rear-view mirror continuously records video images of the surroundings in front of the vehicle, and sends them to the head unit. Control communication tales place over the user interface CAN. The picture signals are sent by the augmented reality camera over an HSVL line to the head unit.

When route guidance with augmented reality is activated, the head unit displays the camera image in the following situations:

The head unit enriches the camera image with the following additional information by overlaying it:

IMPORTANT The enlarged display of traffic lights function is only available if the vehicle is the vehicle closest to the traffic light.

The user can switch the route guidance with augmented reality function on and off via the head unit. In addition, the user can select what information the head unit superimposes on the camera image.

Dynamic route guidance (except code 498 (Japan version), and except code 367 (Live Traffic Information)) 

Dynamic route guidance is performed automatically in the dynamic route guidance or dynamic route guidance with confirmation mode. 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 route guidance 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.

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

The incoming information about the traffic situation can be received by the Radio Data System/Traffic Message Channel (RDS/TMC) function via FM radio or digital radio (DAB) (with code 537 (Digital radio (DAB))) if an appropriate station has been selected.

IMPORTANT Dynamic route guidance is performed through RDS/TMC where no real-time traffic data is received through the HERMES control unit (e.g. no valid subscription or the vehicle is not within the geographical region for which the traffic data service is being provided).

The head unit receives the traffic messages over the following component parts:

Vehicle Information and Communication System (VICS) over the FM multiplexer (with code 498 (Japan version)) 

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 head unit receives the FM-1 signals over the rear window antenna (model 253.3), or the rear spoiler antenna (model 253.9), and the FM 1, AM, ZV and KEYLESS-GO antenna amplifier.

The head unit receives the FM-2 signals over the rear window antenna and the antenna amplifier FM2, DAB and TV2.

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.

Dynamic route guidance with VICS (with code 498 (Japan version)) 

The Vehicle Information and Communication System (VICS) control unit and the Dedicated Short-Range Communications control unit are required for dynamic route guidance. The Vehicle Information and Communication System (VICS) control unit contains both the receiver and the antenna. The antenna communicates with the VICS beacons (transmitter masts) installed by the roadside, which transmit microwave signals within a reception range of 2.5 gigahertz or infrared signals. The received signals are transmitted to the head unit via the Dedicated Short-Range Communications control unit and decoded. The Dedicated Short-Range Communications control unit receives VICS signals in the reception range of 5.8 gigahertz via the DSRC antenna, and forwards them to the head unit. The traffic messages are stored in the traffic data recorder of the head unit, decrypted and forwarded to the navigation processor on request. The navigation processor makes the decision whether the route should be changed. If necessary, a message saying that the route was changed is issued.

Additional function requirements for dynamic route guidance with real-time traffic data via the HERMES control unit (with code 367 (Live Traffic Information)) 

IMPORTANT At the end of the subscription or outside of the geographical area for which the traffic data service is offered, only the dynamic route guidance with radio traffic messages is available.

Dynamic route guidance with real-time traffic data via the HERMES control unit (with code 367 (Live Traffic Information)) 

The HERMES control unit receives the real-time traffic data from the service provider over the emergency call system antenna. The real-time traffic data consists only of information gathered via satellite support.

The Car-to-X-Communication function also enables information about potential hazards in road traffic to be received, either through the recognition potential of the vehicle sensors of other Mercedes-Benz vehicles or manually through the vehicle occupants in a vicinity of 10 km.

The HERMES control unit forwards the real-time traffic data to the head unit. The HERMES control unit receives position data from the head unit at regular intervals. Data are exchanged between the HERMES control unit and the head unit using a wireless connection between the integrated WiFi interface of the HERMES control unit and the Bluetooth® antenna, Bluetooth®/WiFi antenna (A2/161), and the Bluetooth®/WiFi antenna (A2/162) (with code 549 (Connect 20 HIGH (NTG6))).

The HERMES control unit transmits the position data from the head unit to the service provider via emergency call system antenna. In this way, the HERMES control unit contributes to collecting the traffic information, from which the dynamic route guidance then benefits in turn.

  Electrical function diagram for navigation mode (COMAND) function   PE82.85-P-2063-97FBC
  Overview of system components, telematics   GF82.85-P-9999RFM
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