Correcting compass declination
Compass declination is:
Because the earth's magnetic field deviates from the geometrical north and south poles, a magnetic needle will indicate an azimuth that deviates from true north as shown in the picture.
This deviation is called declination.
Declination varies depending on location.
Method for correcting the electric compass's declination
It is hard to correct a compass that uses a mechanical, magnetic needle.
In the case of an electric compass, it is comparatively easy. The steps to calibrate are shown below.
(1)Create a table
Create a table segmenting the mesh of declination angle data from the earth's surface.
Declination data (Make this into a table)
True north = magnetic north + declination data table value
A correction can be calculated using this method.