Prior to the actual construction of an offshore wind farm, a wide variety of hydrographic and geophysical soil investigations have to be conducted on site. In addition, survey vessels are also deployed during the installation work in order to continually monitor possible impact on the marine environment. During the actual construction and operation phase, there are also underwater inspections on the turbines and their environment. This wide range of tasks is performed by survey vessels equipped with various facilities, which may include firmly installed measuring systems, multibeam and sonar systems, special holders for measuring devices, laboratory workstations, outdoor workplaces, fishing gear, cranes and fast winches. Occasionally, survey ships are now already equipped with a DP system that guarantees safe working close to offshore structures.