Bearing Computation Formulas

  1. True Bearing (TB)

True Bearing =Magnetic Bearing ± Declination

True Bearing=Magnetic Bearing ± Declination

  • Use + if declination is East
  • Use – if declination is West

 

  1. Magnetic Bearing (MB)

Magnetic Bearing = True Bearing ± Declination

Magnetic Bearing=True Bearing ± Declination

  • Use + if declination is West
  • Use – if declination is East

 

Special Lines Related to Declination

Term

Description

Isogonic Lines

Lines connecting points with equal magnetic declination.

Agonic Lines

Lines connecting points with zero magnetic declination.
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