The magnetic bearing of a line is 135° 30'. What is the true bearing if the declination is 5° 15'W?

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DDA JE Civil 29 Mar 2023 Shift 2 Official Paper
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  1. 140° 45'
  2. 120° 15'
  3. 115° 45'
  4. 130° 15'

Answer (Detailed Solution Below)

Option 4 : 130° 15'
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Detailed Solution

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Concept:

TB (True Bearing) = MB (Magnetic bearing) ± Declination

(Use + ve for eastern and – ve for western declination)

F2 N.M. N.J 30-07-2019 D7

Calculation:

Given,

Declination = 5° 15' W

Magnetic bearing of Line = 135° 30'

TB (True Bearing) = MB (Magnetic bearing) - Declination

True Bearing = 135° 30' - 5° 15'

True Bearing = 130° 15'

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