Earth's Magnetic Fields Flashcards
What does direction mean in navigation?
Angular position of one point to another point without reference to any distance.
What is the datum that a pilot can fly a direction?
The meridian (arc on earth’s surface from north to south pole).
What is True North?
When direction are measured by reference to the local meridian.
Does true north ever vary?
No
What is the source of the Earth’s magnetic field?
The boiling sear of molten iron.
What causes the earth’s magnetic field to change?
As the liquid iron and nickel moves.
Are the geographic and magnetic poles colocated?
No
What is the difference between the geographic and magnetic poles called?
Magnetic variation
What is magnetic variation?
The angular difference between the direction of True North and Magnetic North at any given point on earth.
What are isogonals?
Lines connecting points of equal magnetic variation.
Is magnetic variation the same at all points on the earth?
No
What are lines of no variation called?
Agonic lines
What is the error related to the aircraft’s influence itself called?
Magnetic deviation
What is the acronym used to convert a true heading to a standby compass heading?
True Variation Magnetic Deviation Compass
