Why magnetic compass is used by sailors and navigators to find the direction?

Why magnetic compass is used by sailors and navigators to find the direction?
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On a magnetic compass, the needle marked North points towards magnetic North, provided there is no ferrous metal nearby. Magnetic North is not the same as geographic North (North Pole). On a metal ship, the magnetic compass has to be adjusted (box the compass) to allow for the metal round the ship. By steering a compass course, allowing for drift caused by the wind and the ebbing and flooding of the tides, a ship should be able to reach a distance port, or at least be with in sight.
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