The invention relates to a localization system for localizing an underground object (1) for an earthmoving machine (2a) comprising a working part (3a). Said localization system comprises a fastening component (4a) and a detector component (5a). The fastening component (4a) can be arranged on the working part (3a) for example by means of magnets. The detector component (5a) is adapted to detect the object (1) using an electromagnetic field that can be associated with the object (1) and is arranged on the fastening component (4a) so as to swing like a pendulum, thereby effecting an alignment ofthe detector component (5a) under the effect of gravity. Optionally, the localization system comprises an arithmetic component for deriving a distance information of the object (1) from the detected value. The localization system also comprises a display component for displaying and/or forwarding the detected value and/or the distance information.