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The magnetic bearing of line AB is 132° 45'. If the magnetic declination is 10° 20'W, the true bearing of the line AB will be
- a)122° 25'
- b)143° 5'
- c)121° 25'
- d)122° 30'
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
The magnetic bearing of line AB is 132° 45. If the magnetic declin...
Magnetic declination: At any place horizontal angle between true meridian and magnetic meridian is called magnetic declination.
For Eastern Declination:
α = β + θe or T.B = M.B + θe
Here, α = True bearing (T.B)
β = Magnetic bearing (M.B), and
θE = Eastern declination
For Western Declination:
α = β – θw or T.B = M.B – θw
Here, θw = western declination.
Calculation:
Magnetic bearing of a line AB = 132°45’
Declination = 10°20’ West
∴ True bearing = 132°45’ - 10°20’ = 122°25' = S57°35’E
For Eastern Declination:
α = β + θe or T.B = M.B + θe
Here, α = True bearing (T.B)
β = Magnetic bearing (M.B), and
θE = Eastern declination
For Western Declination:
α = β – θw or T.B = M.B – θw
Here, θw = western declination.
Calculation:
Magnetic bearing of a line AB = 132°45’
Declination = 10°20’ West
∴ True bearing = 132°45’ - 10°20’ = 122°25' = S57°35’E
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The magnetic bearing of line AB is 132° 45. If the magnetic declin...
The magnetic bearing of line AB is 132 degrees.
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The magnetic bearing of line AB is 132° 45. If the magnetic declination is 10° 20W, the true bearing of the line AB will bea)122° 25b)143° 5c)121° 25d)122° 30Correct answer is option 'A'. Can you explain this answer?
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