Practice Magnetic Declination (1.14.4) - Measurement of Distances - Surveying and Geomatics

Practice: Magnetic declination

Lesson 1.14.4Measurement of Distances

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6 sample questions

Question 1.
What is magnetic declination?
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Think about how we measure direction using a compass.
Question 2.
What do you add to the magnetic bearings when there is eastern declination?
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Remember that eastern declination is a positive angle.
3Question 3.
What does magnetic declination represent?
- The difference between true north and magnetic north
- The average direction of the north pole
- An angle that remains constant
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Focus on its definition regarding direction.
4Question 4.
A compass shows magnetic north. If magnetic declination is +8°, what should you do to find true north?
- Add 8°
- Subtract 8°
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Think about the position of magnetic north relative to true north.
Question 5.
A surveyor measures a magnetic bearing of 150°. The magnetic declination at the site is found to be -12°. Calculate the true bearing and justify your answer.
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Consider how the negative declination impacts your calculation.
Question 6.
During a survey, the team encounters unexpected local attractions, altering their readings. Discuss the steps they should follow to ensure accurate measurements despite these influences.
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Think about how surveyors verify the consistency of their measurements in practice.

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