Practice Quiz

Surveying FS

Category - Geodesy & Mapping

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If the magnetic azimuth (from north) of a line is 120°15’ in a location where the magnetic declination is 12°E, what is the true azimuth of the line?
  1. 108°15’
  2. 132°15’
  3. S 108 ° 15’ E
  4. S 132°15’ E
Explanation
Answer: B - If the magnetic azimuth (from north) of a line is 120°15’ in a location where the magnetic declination is 12°E, the true azimuth of the line is 132°15’.

Solution

Remember the following rule: when changing from magnetic to true azimuth, add east declination and subtract west declination.

True azimuth = magnetic azimuth + east declination

Where magnetic azimuth = 120°15’

East declination = 12°

True azimuth = 120°15’ + 12°

= 132°15’
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