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A Flinders bar is a vertical soft iron bar placed in a tube on the fore side of a compass binnacle. The Flinders bar is used to counteract the vertical magnetism inherent within a ship and is usually calibrated as part of the process known as swinging the compass , where deviations caused by this inherent magnetism are negated by the use of ...
A sample compass correction card, showing the deviation correction for a given heading. Once the compass has been corrected using small magnets fitted in the base and with soft iron balls, any residual deviation is recorded as a table or graph: the compass correction card, which is kept on board near the compass. [6]
English: How to compensate for w:en:magnetic declination when using a compass. In this example, the declination is 14°E (+14°), so the direction indicated by the compass as north is actually 14° East of true North. Thus, if we read 40° (roughly NE) on the compass card, the corrected bearing is 40°+14° = 54°.
4 - Compass north, including a two-part error; the magnetic varation (6) and the ship's own magnetic field (5) 5 - Magnetic deviation, caused by vessel's magnetic field. 6 - Magnetic variation, caused by variations in earth's magnetic field. 7 - Compass heading or compass course, before correction for magnetic deviation or magnetic variation.
Deviation varies for every compass in the same location and depends on such factors as the magnetic field of the vessel, wristwatches, etc. The value also varies depending on the orientation of the boat. Magnets and/or iron masses can correct for deviation, so that a particular compass accurately displays magnetic bearings.
4 - Compass north, including a two-part error; the magnetic variation (6) and the ship's own magnetic field (5) 5 - Magnetic deviation, caused by vessel's magnetic field. 6 - Magnetic variation, caused by variations in Earth's magnetic field. 7 - Compass heading or compass course, before correction for magnetic deviation or magnetic variation.
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[4] [a] Typically the compass will have a stop in the side of the box, which the observer pushes when the Sun is lined up in the sights. This fixes the compass card, from which the magnetic azimuth or amplitude can be read. [3] [b] The sights may consist of two vanes, one with a narrow slit and the other with a wider slit bisected by a thread.