A magnetic trawl is, first of all, a long-range search magnet, it is rectangular in shape (resembles a board). On one side, it has a working surface, and on the other side it is attached to the bottom of a cart or car. The main energy of the magnetic flux is directed at maximum removal. Such a topology is needed to use a magnetic trawl not only as a tag force, but also as a "retriever" at a distance.