Practice Quiz

Surveying FS

Category - Plane Survey Calc

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The magnetic declination at a point was measured as 07°25’ in 1925 and 14°50’ in 2010. If line DE had a magnetic bearing of N45°25’E in 2010, what was the magnetic bearing of the line in 1925?
  1. N38°00’E
  2. N45°25’E
  3. N52°50’E
  4. None of the above
Explanation
Answer: A - If line DE had a magnetic bearing of N45°25’E in 2010, the magnetic bearing of the line in 1925 was N38°00’E.

Solution

1. Determine the angle between magnetic north in 1925 and 2010

α = 14°50’ - 07°25’ = 07°25’ to the east

2. Subtract angle from 2010 magnetic bearing to determine 1925 magnetic bearing

Magnetic bearing (1925) = N45°25’E - 07°25’ = N38°00’E
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