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Flashcards in Direction Deck (14):
1

True north

Has a direction along a meridian towards the geographic North Pole

2

Magnetic North

Direction towards the magnetic North Pole

Slowly moves west

3

Compass north

The compass effected by the a/c local magnetic fields
Angle between magnetic North and compass north

4

Variation

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

5

Isogonic/isogonal

Lines of equal magnetic variation

6

Agonic

Lines of zero variation

7

Deviation

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

8

Isoclines

Lines of equal dip

9

Aclinic

Lines of zero dip

10

Rhomb line

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

11

Great circle and a rhomb line

Equator and meridian

12

Vertices or a single vortex

Points furthest north/south on a great circle

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

13

Antipodal

Points directly opposite each other

E.g vertices

14

Nodes

Point at which the track goes through the equator

Halfway between each vortex