Bearing Computation Formulas
- True Bearing (TB)
True Bearing =Magnetic Bearing ± Declination
True Bearing=Magnetic Bearing ± Declination
- Use + if declination is East
- Use – if declination is West
- 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. |