Darek Grabiec - Hydrographer and an officer of the Navy since 1989, deeply related to hydrography and survey at sea and inland waters. Since 2008 he is an employee of the Navy Hudrographic Office. From 2010 he is the president of the Polish Maritime Hydrographers. In it’s activities, the survey focuses on the implementation of the search and location of small underwater objects using modern sonar techniques. The results are being used not only by hydrography, but also by underwater archeologists, a group of water diving rescue PSP, the police and the prosecutors.