Computational Fluid Dynamics (CFD) has a broad range of applicability potential for tackling aerodynamic problems associated with ships and marine vehicles. This presentation focuses on the utilization of viscous CFD for vast majority of aerodynamic cases that may be encountered during the design process of ships. The accuracy, required computational effort, recent developments and limitations of the method will be evaluated for cases with different levels of sophistication such as force quantification, superstructure streamlining, comfort analysis, exhaust gas assessment, self-noise assessment, time-dependent wake predictions for helicopter landing simulations and wind assisted ship propulsion.