The mariner's compass is an instrument which is used to point out the course of a ship at sea. It consists of three parts: the box, the fly or card, and the needle. The box, which contains the fly and needle, is a circular open brass case, so hung or floated, or otherwise supported, that it retains approximately the same horizontal position in all motions of the ship. The fly is a circular disc, generally of paper, representing the horizon, and divided into 32 equal parts by lines radiating from the centre and called rhumbs or "points." The intervals are subdivided into halves and quarters, and the entire circumference is also divided into 360 parts or "degrees." The angle between "point" and "point" equals, therefore, 11-1/4 degrees. The four chief or cardinal points are north, east, south, and west, and the 32 in their order, beginning from north and moving round to the right.
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