In underground engineering frequently massive damage at cables and pipes arise, that brings high reconditioning charges with it. Consequences for companies are not occasionally financial undoing. Conditions attached to fretting / mineshaft approval have been increased in the last years. When power supply companies grant a shaft approval to an underground engineering company, it has to make supplementary calculations if there are obscurities about the shaft curve and the shaft approval because of the increased duty of care. The retrieve of non-conducting pipes is simplified essential or often at all enabled because of the application of Katimex location-positioning systems. Finding non-conductive pipes is simplified significantly and frequently made feasible for the first time by the use of Katimex® locating systems. The basis of the units is the Polykat® fiberglass rod, which is characterized by extremely high thrust stability whilst simultaneously having small radius of curvature.