Chapter 4 Flashcards
What is true direction?
Your bearing relative to true north
What is variation
The angular difference between geographic and magnetic north
What is magnetic direction?
Your direction taking into account the magnetic variation. The variation changes all over the world
What is an isogonal?
Lines joining areas with the same magnetic variation
What does a green isogonal mean?
There is no magnetic variation
What does a red isogonal mean?
There is Easterly variation
What does a blue isogonal mean?
There is westerly variation
If you have westerly variation will magnetic direction be higher or lower than true variation?
Magnetic higher than true
If you have easterly variation will magnetic direction be higher or lower than true variation
Magnetic will be lower than true
What does the letter M stand for?
i.e. 90degrees M
Magnetic heading
What is a deviation card?
A card in a plane that tells you corrections needed to obtain accurate magnetic readings
What does the letter C stand for? i.e. 217degrees C
Compass direction
Why do you get deviation?
Magnetic fields are altered slightly by the aircraft
If you have deviation west will the compass direction be higher or lower than magnetic direction?
Compass will be higher than magnetic
If you have deviation east will the compass direction be higher or lower than magnetic direction
Compass will be lower than magnetic
Where do compass work best?
Mid latitudes near the equator
What is dip?
The nearer you get to the poles, the less effective a compass will be as it will be prone to pointing downwards
How can you resolve dip?
By using a horizontal component
What happens to a compass when turning?
It reads incorrect due to acceleration but will settle when straight and level
What are the compass checks?
Compass and glass are secure Easy to read No bubbles Compass deviation card is there Turns freely
