CDC Vol 1, 005/006 Common Reference Systems/Military Reference Systems

Question 1

* What reference lines are used to determine latitude and longitude?

Answer 1

• Equator determines latitude - Prime Meridian determines longitude

Question 2

* How many lines of latitude and longitude are there?

Answer 2

• 90 lines of latitude - 180 lines of latitude

Question 3

* Why are latitude and longitude always read from the lower to the higher?

Answer 3

Because positions are always expressed as their distance from the equator and the prime meridian.

Question 5

In GARS (Global Area Reference System) what are the size of the following: - Cell - Quadrants - Keypads

Answer 5

• Cell: 30x30 minutes - Quad: 15x15 minutes - Killbox: 5x5 minutes

Question 6

In CGRS (Common Geographic Reference System) what are the size of the following: - Cell/Killbox - Keypads - Quadrants

Answer 6

• Cell/Killbox: 30x30 minutes - Keypad: 10x10 minutes - Quad: 5x5 minutes

Question 7

What is most widely used to report an object’s location in relation to you or some other position?

Answer 7

Bearing and Range

Question 8

What reference system is the most used reference system in the world for both the military and civilians?

Answer 8

Latitude and Longitude

Question 9

What reference system is used for locating troops in contact for targeting locations?

Answer 9

MGRS (Military Reference Systems)

Question 10

MGRS is designed for world use between ____ degrees north and ____ degress south?

Answer 10

• 84 degress north - 80 degress south

Question 11

MGRS divides the earth into narrow zones of ____ degrees of longitude in width?

Answer 11

6 degrees

Question 12

How many 6 degree zones are in MGRS?

Answer 12

60 zones

Question 13

How is locations expressed in Latitude and Longitude?

Answer 13

Degrees, minutes, and seconds

Question 14

MGRS begins at what meridian?

Answer 14

180 Meridian

Question 15

Is the equator or prime meridian zero degrees north or south? & Is the equator or prime meridian zero degrees east or west?

Answer 15

• Equator is zero degrees north or south - Prime Meridian is zero degrees east or west

Question 16

What is the first part of MGRS called?

Answer 16

Grid Zone Designator

Question 17

What reference system is the standardized battlespace system used across the DoD for battlespace deconfliction?

Answer 17

GARS - Global Area Reference System

Question 18

What reference system is a theater specific system?

Answer 18

CGRS - Common Geographic Reference System

Question 19

Where does GARS begin at?

Answer 19

• 180 Meridian & - the South Pole

Question 20

What two reference systems use common terms with different meanings and has a high risk of causing confusion?

Answer 20

CGRS and GARS

Question 21

What document should define the theater-specific area reference system (GARS/CGRS)?

Answer 21

ACP - Airspace Control Plan

Question 22

GARS and CGRS is not used to describe exact geographic locations or areas smaller than ___ x ___ minutes?

Answer 22

5x5

Question 23

In GARS, how many square NM are quadrants?

Answer 23

25 Square NMs

Question 24

In GARS and CGRS, what is the size of keypads in the respective systems?

Answer 24

• GARS - 5x5 minutes - CGRS - 10x10 minutes