09 Magnetic Direction Flashcards Preview

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Flashcards in 09 Magnetic Direction Deck (14):
1

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

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

2

What is Variation?

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

3

What is the minimum and maximum the Variation can be?

Between 0 degrees and 180 degrees

4

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

+ is East
- is West

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

5

What is the phrase regarding Variation and East and West?

Variation West, Magnetic Best
Variation East, Magnetic Least

6

What are Isogonal Lines?

Lines of equal Variation

7

What are Agonic lines?

Lines of zero Variation

8

Where on the earth is a compass most accurate?

At the equator

9

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

- 90 degrees

- At the North and South Poles

10

What is an Aclinic line?

A line of zero dip angle

11

What is the definition of Deviation?

Angular difference between the Magnetic direction and the Compass Direction

12

What is the phrase regarding Deviation and East and West?

Deviation West, Compass Best
Deviation East, Compass Least

13

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

+ - 10 degrees

14

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

Check the reading matches when lined up on a runway