The use of High Altitude Platforms (HAPs) assupport infrastructure for communications is becoming a relevant topic ofinterest for the research activities on future generation systems. In particular, due to their privileged position (stratosphere), these infrastructures are potentially able to yield advantages in the provision of navigation and positioning services: they can exploit the best features of both satellite-based and terrestrial augmentation systems for GlobalNavigation Satellite System (GNSS). Starting from the results presented in [5], in this note it is described how the Stratolite system [2] can be integrated with the EGNOS [6] systemincreasing the overall navigation performances at the user leve
