GNSS are everywhere in Intelligent Transportation Systems and mobility in general. Satellite positioning has enabled many solutions, applications, innovations to be deployed for the benefit of the road transport sector, after being natively targeted and developed for the need of civil aviation and maritime navigation. Today, despite significant progress have been made in vehicle positioning, research efforts are still needed. Mapping, in addition to GNSS, will also be considered as a necessary complement of the former, in order to get relative location of one's vehicle with respect to the environment. This is redundant with perception systems embedded, like camera vision measuring distance to lane marking, but this redundancy is actually sought for reliability purpose. This article will give an overview of what has been obtained so far in terms of positioning and mapping performance, and will outline the next steps toward reliable performance for advanced ITS applications, among which autonomous vehicles.