GF82.61-P-4003RA Dynamic Route Guidance, Function
GF82.61-P-4003RA Dynamic Route Guidance, Function
- with CODE (352) COMAND operating and display system
- except CODE (491) USA version
- except CODE (498) Japan version
The current traffic situation is taken into consideration in the dynamic route guidance. The navigation system in the COMAND operating, display and control unit (A40/3) can receive the information on the traffic situation alternatively via the Traffic Center Service (TCS) (up to 05.04) or the traffic message channel (TMC).
The services from the Traffic Center Service (TCS) are offered by an external provider and an application is to be sent to the provider for use.
Traffic messages via Traffic Center Service (TCS) (up to 05.04)
The service provider transmits the traffic situation as SMS (Short Message Service) message via the telephone D-net and is subject to fees.
The service provider transmits traffic data only when a request is received from the vehicle.
The request can be sent either:
^ Cyclically, every 15 minutes
^ Once
To reduce the quantity of data, when information is requested, the current location of the vehicle is automatically transferred to the D- network center.
The service provider then transmits only traffic messages at within a radius of approx. 75 km of the vehicle.
The vehicle's telephone system picks up the traffic news and forwards it as follows:
^ With the MB portable CTEL telephone Code (854) or MB standard telephone Code (853), via the telephone interface (A34/4) to the traffic data recorder (see block diagram)
^ With TELE AID emergency call system (D2B) Code (855) via the D2B telephone transmitter/receiver to the traffic data recorder (no figure provided)
It is possible to use the telephone during TCS data interchange. The traffic data memory is integrated into the COMAND operating, display and control unit (A40/3).
Traffic messages via Traffic Message Channel (TMC)
Information on the current traffic situation is broadcast via FM radio (UKW) free of charge by specially equipped regional radio stations. A suitable FM/RDS transmitter must be tuned in.
The radio tuner receives the traffic messages from the left antenna amplifier module (A2/64) and the right antenna amplifier module (A2/65) via a common antenna line and then transmits them to the traffic data recorder (see block diagram).
Since no communication is accomplished between the vehicle and broadcasting corporation with TMC messages, the traffic data recorder selects the traffic messages related to the route on which the vehicle is presently driving as well as the surrounding area.
Traffic information analysis
In both cases (TCS or TMC) the traffic data memory decodes the traffic information and forwards it when requested to the navigation computer (internal). The navigation processor makes the decision whether the route should be changed.
If necessary, a message that the route should be changed is output via the vehicle speaker. For synchronization tasks the traffic data recorder requires an up-to-date "location list" from the navigation computer.
Each stretch of road and each striking feature (e.g. expressway exit) of the road network detected is clearly defined by means of a number. This list is originally stored on the CD-ROM.
It is automatically loaded into the traffic data memory as required (e.g. when CD-ROM is changed). 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. They can also be displayed as clear text. For this purpose, press the "JAM" button for t ≥2 seconds and activate the menu "TRAFFIC-INFO".
The "Navigation -> Settings -> Traffic Information Source" menu can be used to select the mode (TMC or TCS). A mixed operation of TMC and TCS is not possible.
