Coefficient of Deviation and Magnetic Compass Deviation Calculation -

Abstract

Determination of the deviation of the magnetic compass is imperative as the magnetic compass is an essential equipment that all ships have to be equipped with. Although there was a more modern gyro compass in its place. But the major limitation of the Gyro compass is that it still has to rely on the power system. If the power source fails, it cannot be used. Because the north of the magnetic compass and the Gyro compass are different. Magnetic North and True North belong to different sub-districts. The difference between magnetic and true north produces a variance. Also, the main structure and hull components are made of steel. The combined force due to the magnetism in the hull directly affects the magnetic compass, causing the direction of magnetic north to be misaligned. This happens, called deviation, where the deviation is in every direction the ship is facing. It can be obtained by calculating from the desired deviation coefficient and the bow direction.