JPS5829875B

A cable buried under a sea bottom is located by flowing in the cable an electrical current, and measuring the magnetic flux by said current at four points near the cable. The present cable detecting system comprises nondirectional flux measurement means searching for the cable to be detected and measuring the flux by said electric current at four vertex points forming a horizontal square plane, means for transmitting the measured values to a cable ship, means mounted in said ship for providing squared amplitude ratios of each of said magnetic flux to a selected one of the magnetic flux, and means for providing the distance to the cable from the center of said four vertex points, the angle between the transverse direction to the cable and the extension of the diagonal line of said four vertex points, and the depth between the cable and said horizontal square plane, on the principle that said amplitude ratio is equal respectively to the reciprocal of the corresponding ratio of the distance between said cable and each of said points.