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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]
This card, or graph, lists the deviation for various compass courses and is referred to by the navigator when compass courses need to be corrected. It is named after the English navigator Matthew Flinders (1774-1814) who wrote a paper on ships' magnetism for the Royal Navy .
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.
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English: Black&White version of Compass Card.svg by Denelson83. Each one of the 32 sectors means 11.25 degrees. Each one of the 32 sectors means 11.25 degrees. Colours removed and scaled to be easily printed on A4 b&w laser printers.
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A floating card compass always gives bearings in relation to magnetic north and cannot be adjusted for declination. True north must be computed by adding or subtracting local magnetic declination. The example on the left demonstrates a typical conversion of a magnetic bearing from a floating card compass to a true bearing by adding the magnetic ...
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