This paper shows the results of the implementation and integration of the standardized MAPS&ADAS interface for a precision navigation in ACC. The paper explains how driver assistance systems, using ACC as an example, can take advantage of navigation data. The operational concept of the assistance function has to be designed according to the particular properties of this additional data source. Even with the quality of navigation data available today, BMW’s ACC system can be enhanced by dynamics, which adapt to the situation, providing even more benefit for the driver. Also considerations on the realization of map based advanced ACC like implementation issues, system architecture, bus and gateways as well as specific problems are outlined.