We have an error curve of Direction Finder only after installed the equipment on board , so I think it shali be convenient to know error value apbroximately and to decide the DF antenna ' s position to make less error before actual setting . It is weU known that the DF error caused . by surroundings , the hull of the ship , the masts , the fuDneL the rigging , the stays , the derricks etc . This paper shows how to take the apprQximate error due to the hull by using a scale 皿 odel . The

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... of this experiment is as follow that the electromagnetic field disturbed by the hull is similar to the electric current pattern around dielectric in the equability current