Nautical Term: Compass, magnetic
Definition of Compass, magnetic
A magnetic compass is an essential navigational tool on board a ship. The compass consists of a magnetized needle free to rotate in a glass-enclosed bowl filled with a liquid such as mercury. The compass is mounted in a box with a transparent window, allowing the mariner to view the compass and take bearings to determine the ship’s direction and position. The compass is the primary instrument for navigation, as the ship’s course through the water depends on the efficient use of this vital navigational tool.
Example: As the sun began to set, the captain of the cargo ship consulted his magnetic compass to determine their present course and position. The compass bearing indicated that they were currently sailing due east. The captain then plotted their present position on the ship’s chart, and consulted with his navigators to plan their next course to reach their intended destination.
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