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The accurate characterization of ship motions in different seaways is a basic requirement in the design of an effective ship motion control system. Traditionally, ship motion characteristics are obtained either by conducting model tests or by using numerical simulation based on simplified theories. However, model tests are typically expensive and time-consuming, and simplified theories may not be suitable for advanced hull forms such as wave piercers or multi-hulls and for ships operating at high speeds. More advanced numerical simulation tools are needed. In this paper, an advanced numerical simulation method is described that incorporates nonlinear, time-domain wave-body hydrodynamics and control system models for the design and assessment of motion control systems. Sample results using these control systems are shown to demonstrate the efficacy of these systems.