This paper presents the new concept SLAG to design autonomous navigation systems. More precisely, we noticed that the classical approaches are sometimes not efficient and not enough robust to be used under many conditions. This is an approach dedicated to the vehicle automatic guidance. It consists in integrating a cognitive process within the localization module in order to provide an estimation according to the application needs. Thus, the localization module is coherent with the application but it is especially efficient and selfrobust. Many experimentations of automatic vehicle path tracking were made in outdoor environment and some of them under a strong hailstorm showing the relevance of the proposed approach (A video is available at: http://tessiercedric.free.fr).