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Included angle is the angle between the two meridians
Calculation of included angle (a):
When both reduced bearing (RB) in same quadrant,
a = 2nd RB – 1st RB
When 1st RB in 1st quadrant and 2nd RB in 2nd quadrant,
a = 180 – (2nd RB + 1st RB)
When 1st RB in 1st quadrant and 2nd RB in 3rd quadrant,
a = 180 + (2nd RB – 1st RB)
When 1st RB in 1st quadrant and 2nd RB in 3rd quadrant,
a = 2nd RB – 1st RB