Civil Engineering MCQAE Level Civil Engineering
If the magnetic declination at a place is 3 degrees East, and the magnetic bearing of a line is 48 degrees (WCB), the true bearing is:
SurveyingMagnetic DeclinationMEDIUM
Choose the correct answer
A
45 degrees
B
51 degrees
C
48 degrees
D
3 degrees
Correct Answer
B. 51 degrees
Why is this the answer?
True Bearing = Magnetic Bearing + Declination (East) = 48 + 3 = 51 degrees (WCB). If declination is West: True bearing = Magnetic bearing - Declination. Magnetic declination changes slowly over years (secular variation) and varies with location (isogonic lines on maps).
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