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Flashcards in Direction Deck (14)
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1
Q

True north

A

Has a direction along a meridian towards the geographic North Pole

2
Q

Magnetic North

A

Direction towards the magnetic North Pole

Slowly moves west

3
Q

Compass north

A

The compass effected by the a/c local magnetic fields

Angle between magnetic North and compass north

4
Q

Variation

A

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

5
Q

Isogonic/isogonal

A

Lines of equal magnetic variation

6
Q

Agonic

A

Lines of zero variation

7
Q

Deviation

A

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

8
Q

Isoclines

A

Lines of equal dip

9
Q

Aclinic

A

Lines of zero dip

10
Q

Rhomb line

A

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
Q

Great circle and a rhomb line

A

Equator and meridian

12
Q

Vertices or a single vortex

A

Points furthest north/south on a great circle

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

13
Q

Antipodal

A

Points directly opposite each other

E.g vertices

14
Q

Nodes

A

Point at which the track goes through the equator

Halfway between each vortex