GATE CE 2015 Set 1 — Question 65
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Geomatics Engineering → Maps & Coordinate Systems → Bearings & Azimuths
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Question
In a region with magnetic declination of , the magnetic Fore bearing (FB) of a line was measured as . There was local attraction at . To determine the correct magnetic bearing of the line, a point was selected at which there was no local attraction. The magnetic FB of line and were observed to be and , respectively. What is the true FB of line ?
Correct answer
(C) N84¹⁰'E
Solution
1.Determine local attraction at A:
- Observed FB of at .
- Observed FB of at . Since is free from local attraction, this is the correct Back Bearing (BB) of .
- The correct FB of should be .
- Error at . This means the magnetic needle at is deflected towards the East.
- Observed Magnetic FB of .
- Since the needle is deflected East, the reading is less than the actual magnetic bearing.
- Correct Magnetic FB of .
- True FB = Correct Magnetic FB + Declination (East is positive).
- True FB .
- In Quadrantal Bearing: .
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