A theoretical model for the over-all ship's magnetism was developed, on the assumption that the magnetism of a three-island type vessel can be regarded as that of the prolate spheroidal magnetic body. Modelled values were determined by the simulation on the base of the theoretical analysis of the magnetic field around the above-mentioned magnetic body. The real values were made of the data observed from four different three-islands type vessels alongside the piers. The agreement between the modelled and real values was found to be accurate.

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