The present part of this paper relates to a procedure of carrying out several kinds of steering tests employing a free-running, self-propelled model and of analysing the results to obtain a general description upon her manoeuvrability in terms of “steering quality indices”. These indices are composed of the coefficients of the equation of motion of a ship and describes well her character in steering. Frequency response analysis on circular turning, sinusoidal steering and turning-sinusoidal steering tests yields a reliable way of determining these indices for each level of turning angular velocity, considering that the indices vary with the level by reason of “nonlinear effect”. A proposed standard procedure of free-model steering experiment is finally presented.