A continuous effort has been made to investigate flow field around two full ships in maneuvring motion by means of numerical and experimental methods. Following the previous reports a finitevolume simulation method based on the Navier-Stokes equation is applied to the ships in steady turning motion, and the flow field is thoroughly studied and compared with measured results in the present paper. The degree of accuracy in predicting hydrodynamic forces and moments is improved by revising the numerical method. Detailed measurement of the flow field on the vertical plane at A. P. is carried out in the steady turning motion and the results agree well with numerical solutions. The typical characteristics of the flow field in steady turning condition is revealed by the numerical simulation and the relations between hull form, flow field and forces are clarified.