Calculate the magnetic declination, if the magnetic bearing of a line is N81°E and true bearing of the line is N77°E.
pqacdh; voufr dh x.kuk djsa] ;fn fdlh js[kk dh pqacdh; fn'kk N81°E gS vkSj js[kk dh okLrfod fn'kk N77°E gSA
4 degree eastward
8 degree eastward
4 degree westward
4 degree southward
4 degree westward
Given:
Magnetic Bearing = N81°E
True Bearing = N77°E
As we know that,
True Bearing = Magnetic Bearing + Magnetic Declination
So, 77° = 81° + Magnetic Declination
∴ Magnetic Declination = –4° or 4°W
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