GF82.61-P-4003GH Dynamic Route Guidance, Function
GF82.61-P-4003GH Dynamic Route Guidance, Function
- with CODE (352a) COMAND operating and display system
- except CODE (491) U.S. version
- except CODE (498) Japanese version
During the dynamic route guidance the traffic situation at any given time is taken into account. The navigation system in the COMAND operating, display and control module (A40/3) can receive the information on the traffic situation optionally via the Traffic Center Service (TCS) or the Traffic Message Channel (TMC) .
Traffic messages via Traffic Center Service (TCS)
Information on the current traffic situation is made available for a fee by a service provider as an SMS message (Short Message Service) over the CTEL D-net. The traffic data are only transmitted when the service provider receives a corresponding request from the vehicle. The request is accomplished optionally:
- cyclically, every 15 minutes or
- once
In order to reduce the data volume the current location of the vehicle is automatically sent to the D-net center. The service provider then transmits only traffic messages within a radius of approx. 75 km of the vehicle.
The vehicle telephone system receives the traffic messages and transmits them as follows:
- for portable CTEL D-net ( D2B) (code 317) via the D2B CTEL Interface (A59/1) and the digital databus ( D2B) to the traffic data recorder or,
- for fixed CTEL installation (code 316) via the CTEL interface (A34/4) and the digital databus ( D2B) to the traffic data recorder or,
- for the TELE AID emergency call system (D2B) (code 347) via the TELE AID control module (A35/8) D2B and the to the traffic data recorder.
The traffic data recorder is integrated into the COMAND operating, display and control module (A40/3).
Traffic messages via Traffic Message Channel (TMC)
Information on the current traffic situation is broadcast regionally at no cost TM Cover FM. For this purpose it by radio stations using the is necessary to select a corresponding FM/RDS station.
The radio receives the traffic messages over the rear window antenna (A2/32) and FM/AM amplifier (A2/18) , whereupon it is then forwarded over the radio tuner to the traffic data recorder.
Because no direct communication takes place between the vehicle and the radio station during a TMC message, the traffic data recorder selects the traffic messages, which are relevant to the section of the route and surrounding area currently being driven.
Traffic information analysis
In both cases the traffic data recorder decodes the (TCS or TMC) traffic information and forwards it on request to the navigation computer internally). The navigation processor makes the decision ( whether the route should be changed.
Where applicable, a message is issued over the vehicle speaker stating that the route has been changed.
For synchronization the traffic data memory requires a current "location list"from the navigation processor. In this list each stretch of the route and each salient point (e.g. freeway junction) of the road network are clearly defined by a number. This list was originally stored on the navigation CD.
It is loaded automatically into the traffic data recorder , if required e.g. changing CD-ROM).
The traffic information stored in the traffic data recorder is automatically deleted after half an hour; a maximum of 100 messages can be stored.
The decoded traffic messages are marked on the map using suitable symbols. It can also be displayed as plain text.
For this purpose press the " Detour" button, and then the " TRAFFIC INFO" menu is activated.
The "Navigation -> settings -> source of traffic information" menu can be used to select the ( TMC or TCS) mode. Use of both the TMC and TCS modes is not possible.