Flashcards in 09 Magnetic Direction Deck (14):
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
What is Variation?
Variation is the Angular difference between the True direction and the Magnetic Direction
What is the minimum and maximum the Variation can be?
Between 0 degrees and 180 degrees
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
What is the phrase regarding Variation and East and West?
Variation West, Magnetic Best
Variation East, Magnetic Least
What are Isogonal Lines?
Lines of equal Variation
What are Agonic lines?
Lines of zero Variation
Where on the earth is a compass most accurate?
At the equator
What is the maximum dip angle and where is it found?
- 90 degrees
- At the North and South Poles
What is an Aclinic line?
A line of zero dip angle
What is the definition of Deviation?
Angular difference between the Magnetic direction and the Compass Direction
What is the phrase regarding Deviation and East and West?
Deviation West, Compass Best
Deviation East, Compass Least
What is the accuracy limit for a Direct Reading Compass (DRC)?
+ - 10 degrees