You can improvise a compass by taking a razorblade OR needle (any piece of ferrous metal actually) and magnetize it by using a magnet: The magnets in your telephones headset can be used, just to mention one possibility
Move the magnet over the razor/needle with 30-40 steady strokes going in the same direction.
The start/end the strokes, will later be the South and North direction of the compass.
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