The Chair of Geoinformatics on behalf of the Navy Hydrographic Office, Maritime Office in Szczecin, Szczecin City Hall and the Association of Polish Maritime hydrographers is pleased to invite to the World Hydrography Day, which will be held on 23-24 June 2012 at Wały Chrobrego.During the World Hydrography Day Maritime University unit - Hydrograph XXI and its equipment, inter alia, hydrographic sonar probe will be presented. The program framework for the national celebration of World Hydrography Day is attached below .