Project of JSC «Baltic Aerogeodesic Enterprise». The works were carried out in order to establish a special regime of economic and other activities, to protect and restore the internal resources of the water body, to improve its hydrological regime and sanitary condition.
The object of the work was the rivers of the Curonian Basin, the Vislin Bay and the Baltic Sea in the Kaliningrad Region. The total length of the surveyed watercourses was 1557.1 km. The work was carried out in several stages.