ISO 15075:2003规定了车载导航系统使用的信息内容和格式。它的重点是生成或增强路由指令所需的消息。特别关注的是不一定包含在更通用的流量管理消息列表中的消息。 尽管ISO 15075:2003强调了使用车载地图数据库的本地确定路线指引（LDRG）系统的要求，但它也包括主要由中央确定路线指引（CDRG）系统使用的信息和某些增值信息。

ISO 15075:2003 specifies message content and format utilized by in-vehicle navigation systems. Its emphasis is on messages that are required to generate or enhance routing instructions. There is a particular focus on messages that would not necessarily be included in a more general traffic management message list. Although ISO 15075:2003 emphasizes requirements for Locally Determined Route Guidance (LDRG) systems that utilize on-vehicle map databases, it also includes messages that would be utilized primarily by Centrally Determined Route Guidance (CDRG) systems and certain value-added messages.