Direction

Question 1

True north

Answer 1

Has a direction along a meridian towards the geographic North Pole

Question 2

Magnetic North

Answer 2

Direction towards the magnetic North Pole

Slowly moves west

Question 3

Compass north

Answer 3

The compass effected by the a/c local magnetic fields

Angle between magnetic North and compass north

Question 4

Variation

Answer 4

Difference between true and magnetic
Given as east or west
Biggest variation is 180*

Question 5

Isogonic/isogonal

Answer 5

Lines of equal magnetic variation

Question 6

Agonic

Answer 6

Lines of zero variation

Question 7

Deviation

Answer 7

Difference of magnetic and compass
Given as east or west
Given as + or -
+ = east - = west

Question 8

Isoclines

Answer 8

Lines of equal dip

Question 9

Aclinic

Answer 9

Lines of zero dip

Question 10

Rhomb line

Answer 10

Lines of equal heading and direction
When compared with a great circle it is closer to the equator
E.g equator or a parellel of latitude

Easy to navigate, not the shortest route but has he same angle to the meridian and track throughout

Question 11

Great circle and a rhomb line

Answer 11

Equator and meridian

Question 12

Vertices or a single vortex

Answer 12

Points furthest north/south on a great circle

Have the same north and south lat as they are both opposite

Question 13

Antipodal

Answer 13

Points directly opposite each other

E.g vertices

Question 14

Nodes

Answer 14

Point at which the track goes through the equator

Halfway between each vortex