runtime formats are typically proprietary, preventing interoperation of maps between different navigation systems. however a new initiative called navigation data standard (nds) is an industry grouping of car manufacturers, navigation system suppliers and map data suppliers whose objective is the standardization of the data format used in car navigation systems. companies involved include tomtom, bmw, volkswagen, daimler, renault, adit, alpine electronics, navigon, bosch, denso, mitsubishi, harman becker, panasonic, ptv, continental ag, navteq and zenrin.