When working offshore on a floating vessel, the vessel will be subjected to wave induced motions and with a moving crane tip, a suspended load can start to swing. When the motions of the load become too large, the operation is interrupted. Alternatives such as jack-ups, function as a fixed platform to which the crane is attached, therefore eliminating the effect of waves on the workability of the vessel. Within the offshore wind industry, jack-ups are used for installation and maintenance of wind turbines. However, due to their slow transit speed and time-consuming jacking process, an alternative is suggested with which wind turbine maintenance can be performed. In this thesis study, the mechanical feasibility of a motion compensated crane for wind turbine maintenance is assessed by comparing three different crane concepts.