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Master Farm Structure and Surveying – Notes, Case Studies & Practical Insights – with Rahul

Fore Bearing (FB) and Back Bearing (BB)

  • FB: Bearing in the direction of progress.
  • BB: Bearing in the opposite direction.

Formulas

a) In WCB System

BB = FB ±1800

BB=FB±1800

  • Add 180° if FB < 180°
  • Subtract 180° if FB > 180°

 

b) In QB System

FB

BB

N θ E

S θ W

S θ E

N θ W

S θ W

N θ E

N θ W

S θ E

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