Magnetic Compass

Question 1

Variation

Answer 1

Angular difference between true north and magnetic north.

Question 2

Agonic line

Answer 2

The line where there is no angular difference.

Question 3

Isogonic

Answer 3

Lines showing the angular lines difference.

Question 4

Deviation

Answer 4

Error due to magnetic interference within the aircraft.

Question 5

Magnetic dip

Answer 5

• Magnet in compass tries to point to pole/earth’s center
• Causes errors in turns and acceleration
• Acceleration error: function of Newton’s first law
• Turning error: caused by vertical lines of flux near poles

Question 6

Acceleration error- ANDS

Answer 6

Accelerating gives a turn to the North and Decelerating to the South.

Question 7

Turning errors

Answer 7

• When turning from East or West Heading
• Undershoot North
• Initially indicate turn to opposite direction (northern hemisphere)
• Overshoot South
• Heading will lead the turn (northern hemisphere)

Question 8

Oscillation error

Answer 8

Erratic movement of the compass due to turbulence