Chapter 2 Flashcards
1
Q
What is variation?
A
Angular difference between true and magnetic north
2
Q
What is a isogonal?
Average value?
A
Line joining two points of equal variation
20E
3
Q
What is deviation?
A
Angular difference between magnetic and compass
4
Q
What’s an agonic line?
A
Line joining two points of 0 variation
5
Q
What does a change in longitude mean in a lambert or polar stereographic chart?
A
Means a change in true direction
6
Q
What is convergence.
A
Angular difference between grid north and true north
7
Q
What is grivation a combination of?
A
Convergence and variation
8
Q
Lines of equal grivation are known as what?
A
Isogrivs
