Spatial reference system of Serbia

The existing national reference system in Serbia, used for over 70 years, is based on the non - geocentric Bessel ellipsoid and Gauss - Kruger projection of meridian zones. Practically, system was realized through trigonometric points of different classes, whose coordinates have been determined for a long period of time, using different surveying technologies and methodologies. Considering the achievements, both in geodetic methodology and surveying technology, it is obvious that the existing Serbian reference system does not match the actual demands on accuracy and reliability, whether by definition or realization.