A method and a device for detection of physical or approximately physical bottom
contact for objects, for instance fishing tackles, which are dragged closely above
or on a sea bottom, said method consisting of sensoring an alteration of a force
acting on a tension sensor (4) as a consequence of a mass (7) coupled
to the tension sensor (4) coming into physical contact with the bottom,
said alteration being used as indication of bottom contact, and that frictional
forces (F2) being due to the dragging of the mass (7) along the bottom
mainly are taken up by means of a tension release means (8). The device
comprise the mass (7) being suspended in a tension sensor (4) in
such a manner that the sensor (4) is actuated by bottom contact, and at
least one tension release means (8) connected to the mass (7) and
adapted to take up forces caused by dragging of the mass above the bottom.