HEPOS, the HEllenic POsitioning System, is a nation-wide RTK network that will modernize the geodetic infrastructure of Greece. The establishment of HEPOS is part of the project "Information and Technology Infrastructure for a Modern Cadastre" which is run by Ktimatologio S.A., a state-owned private sector firm that is in charge of establishing the Hellenic Cadastre. HEPOS will contribute to the establishment of the Hellenic Cadastre by offering an inexpensive way of systematic collection of precise and homogeneous spatial data.