The EUPOS initiative is an international expert group of public organisations coming from the field of geodesy, geodetic survey and satellite deployment. Partners from 18 CEE countries work on the provision of compatible spatial reference infrastructures by using the Global Navigation Satellite Systems (GNSS) GPS, GLONASS and as soon as available GALILEO by operating Differential GNSS EUPOS reference station services. The EUPOS services allow a high accuracy and reliability for positioning and navigation and provide a wide range of geoinformation applications on this basis.