A plotting compass is a small magnet which is suspended and is free to rotate. When it is near a magnet, the compass will always point in a particular direction (the north pole's direction) becasue of the force of the magnetic field.
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The plotting compass itself consists of a very small, suspended magnetic needle. If the plotting compass is placed in the magnetic field of a bar magnet, the needle will line up such that its north pole is attracted to the south pole of the magnet.
To show the field lines of a magnet as well as the magnetic effects of electric current.
a very small compass ,used to find the directions of magnetic forces around a magnet