GF82.61-P-4003QA Dynamic Route Guidance, Function

GF82.61-P-4003QA Dynamic Route Guidance, Function
- with CODE (353) Audio 30 APS

The current traffic situation is taken into consideration in the dynamic route guidance. The COMAND navigation system Audio 30 APS can receive information on the traffic situation either by the Traffic Center Service (TCS) 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)
The latest traffic situation information is transmitted by a service provider for a fee in the form of an SMS (short message service) signal via the CTEL D network. The traffic data are only transmitted when the service provider receives a corresponding request from the vehicle.

The request can be sent either:
- Cyclically, every 15 minutes
- Once

In order to reduce the data volume the current location of the vehicle is automatically sent to the D network center when the information request is posted.

The service provider then transmits only traffic messages at within a radius of approx. 75 km of the vehicle. The telephone system of the vehicle receives the traffic announcements and transmits them via the D2B to the traffic data recorder that is integrated in the radio (A2).

It is possible to use the telephone during TCS data interchange.

Traffic messages via Traffic Message Channel (TMC)
Information on the current traffic situation is transmitted by a specially equipped radio-broadcast station aimed at specific areas and coded (toll) or uncoded (toll free) via VHF. For this purpose an appropriate FM/RDS station must be tuned in.

The radio (A2) receives the traffic announcements and transmits them to the traffic data recorder. 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 recorder decodes the traffic information and forwards it when requested to the navigation computer. 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 purposes the traffic data recorder needs a list from the navigation processor, in which each stretch and each striking feature (e.g., freeway exit) of the recorded street network is clearly defined with the aid of a number. The list is originally stored on DVD. If required (e.g. changing the DVD) it is automatically loaded into the traffic data recorder. The traffic information stored in the traffic data recorder is erased automatically after 0.5 hrs., max. 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. To this end the "alternate route" button should be pressed and the "TRAFFIC INFO" menu activated.