This study has been made on the interrelation between the ship's motions and warp tension, and discussed on the basis of an experimental study of a full-scale ship during fishing operations. The field measurement was conducted on a 600 GT fishery training ship from 10th to 25th of December, 1980. In the experiment, recording of warp tension and the ship's motions was made on the data recorder (KYOWA, RTP-501AL). To the analysis of these recorded data, the statistical method was applied. The several results obtained have been as follows: 1) The amplitudes of warp tension and the ship's motions were to the Gaussian distribution. Moreover, the maxima of warp tension and the ship's motions were distributed according to Rayleigh's distribution functions. 2) The frequency response functions of warp tension to the ship's motions were estimated by the cross spectrum method.
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