The relations among the three elements of Earth's magnetic field,namely horizontal component $H$,vertical component $V$,and angle of dip $\delta$ are,($B_{E} =$ total magnetic field):
- A$V=B_{E} \tan \delta, H=B_{E}$
- B$V=B_{E} \sin \delta, H=B_{E} \cos \delta$
- C$V=B_{E} \cos \delta, H=B_{E} \sin \delta$
- D$V=B_{E}, H=B_{E} \tan \delta$
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