magnetic compass error

The errors of the magnetic compass mainly include magnetic variation and self-difference, both of which will affect the accuracy of the magnetic compass.

Magnetic aberration is caused by the misalignment of the geomagnetic pole and the geographical north pole. It is the angle between the magnetic north pole and the true north pole, also known as magnetic declination. Magnetic variation varies from place to place and changes with time, so it needs to be corrected according to the magnetic variation and annual change rate marked on the chart or compass flower.

The self-difference is caused by the interference of the ship's own magnetism on the magnetic compass. It is the angle between the magnetic needle and the magnetic north pole, also known as the magnetic deflection angle. The self-difference changes with the heading and is affected by the structure, material, current and other factors of the ship. Therefore, it is necessary to regularly check and calibrate, and make a self-difference table or self-difference curve chart for correction.

The magnetic compass needs to be calibrated regularly to eliminate magnetic differences and self-differences and improve its accuracy and reliability. There are many methods to calibrate the magnetic compass. One of the simple methods is to use the gyrocompass as a reference and adjust the magnetic compass of the magnetic compass. Rod and soft iron to eliminate errors

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