Disclosed are an apparatus and a method for fast path search using learning of a heuristic function according to the present invention. An inner ring of the supporting bearing is press fit onto the fitting portion via a predetermined interference. The ring tone data is used for generating a ring tone of the second mobile phone. The underwater electrically insulated magnetically coupled antenna may be located within a body of water or may be buried in the seabed. The word consists os a plurality of phonemes, each phoneme corresponding to a sound and to at least one letter. In this way, when the distance-measuring device measures the measured object, the error due to the variation of the ambient temperature is avoided according to the calibrating method.