09 Magnetic Direction

Question 1

What are the three types of direction and how are they related?

Answer 1

• True Direction
• Corrected by the Variation gives
• Magnetic Direction
• Corrected by Deviation gives
• Compass Direction

Question 2

What is Variation?

Answer 2

Variation is the Angular difference between the True direction and the Magnetic Direction

Question 3

What is the minimum and maximum the Variation can be?

Answer 3

Between 0 degrees and 180 degrees

Question 4

When given a Variation or Deviation of + or - what do these relate to?

Answer 4

+ is East
- is West

These symbolise what happens to the magnetic direction to give the true direction

Question 5

What is the phrase regarding Variation and East and West?

Answer 5

Variation West, Magnetic Best

Variation East, Magnetic Least

Question 6

What are Isogonal Lines?

Answer 6

Lines of equal Variation

Question 7

What are Agonic lines?

Answer 7

Lines of zero Variation

Question 8

Where on the earth is a compass most accurate?

Answer 8

At the equator

Question 9

What is the maximum dip angle and where is it found?

Answer 9

• 90 degrees

- At the North and South Poles

Question 10

What is an Aclinic line?

Answer 10

A line of zero dip angle

Question 11

What is the definition of Deviation?

Answer 11

Angular difference between the Magnetic direction and the Compass Direction

Question 12

What is the phrase regarding Deviation and East and West?

Answer 12

Deviation West, Compass Best

Deviation East, Compass Least

Question 13

What is the accuracy limit for a Direct Reading Compass (DRC)?

Answer 13

+ - 10 degrees

Question 14

What is one way to test a Direct Reading Compasses accuracy?

Answer 14

Check the reading matches when lined up on a runway