Magnetic Compass
The magnetic compass contains a compass card attached to a magnetized needle, which is housed in a liquid.
Errors
- Oscillation errors: Erratic movement of the card caused my turbulence or rough control inputs
- Deviation errors: Errors caused by the magnetics fields produced by equipment
in the aircraft
- Corrected by the calibration on the compass card
- Variation errors: Error caused by the difference between true and magnetic
north
- Corrected by isogonic lines
- Dip errors
- Acceleration errors: On east or west heading, the compass will show a
momentary turn to the north when accelerating, and to the sound when
decelerating.
- Accelerate
- North
- Decelerate
- South
- Northerly turning errors: On north or south headings, the compass will lead
in the north half of the turn, and lag in the south half of the turn.
- Undershoot
- North
- Overshoot
- South
- Acceleration errors: On east or west heading, the compass will show a
momentary turn to the north when accelerating, and to the sound when
decelerating.