Steady drifting condition is analyzed based on experimental and numerical data for hydrodynamic and aerodynamic forces acting on a ship in drifting motion. It is pointed out that plural steady drifting conditions have possibility to exist in wind, wave and current conditions. Model experiments for drifting motion in regular wave were carried out. Averaged values in steady drifting motions indicate that steady drifting condition is not unique but depends on initial conditions. Actual case of a disabled drifting ship is analyzed. Numerical calculation was carried out to obtain possible steady drifting conditions for assumed external forces corresponding to the actual case. Calculated solutions are compared with the actual steady drifting condition.