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Land Navigation
Army Study Guide
63
Other
Professional
07/05/2008

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Cards

Term
What is the Field Manual for map reading and land navigation?
Definition
FM 3-25.26
Term
What are the basic colors of a map, and what does each color represent?
Definition

Black - Indicates cultural (man-made) features such as buildings and roads, surveyed spot elevations, and all labels.

 

Red-Brown - The colors red and brown are combined to identify cultural features, all relief features, non-surveyed spot elevations, and elevation, such as contour lines on red-light readable maps.

 

Blue - Identifies hydrography or water features such as lakes, swamps, rivers, and drainage.

 

Green - Identifies vegetation with military significance, such as woods, orchards, and vineyards.

 

Brown - Identifies all relief features and elevation, such as contours on older edition maps, and cultivated land on red-light readable maps.

 

Red - Classifies cultural features, such as populated areas, main roads, and boundaries, on older maps.

 

Other - Occasionally other colors may be used to show special information. These are indicated in the marginal information as a rule.

Term
What are military symbols?
Definition
Figures used to represent types of military organizations, installations, and activities
Term
Where is the Legend of the map found?
Definition
Lower left margin
Term
What are contour lines?
Definition
Imaginary lines on the ground connecting equal elevation, they represent high and low ground elevation.
Term
What are 3 types of contour lines?
Definition
Index
Intermediate
Supplementary
Term
How many Mils are in one Degree?
Definition
17.7 mils
Term
How many Norths are there on a military map?
Definition
Three:
True north
Magnetic north
Grid north
Term
What shape are the contour lines that indicate a hill?
Definition
A hill is shown on a map by contour lines forming concentric circles. The inside of the smallest closed circle is the hilltop.
Term
What shape are the contour lines that indicate a saddle?
Definition
A saddle is normally represented as an hourglass
Term
What shape are the contour lines that indicate a valley?
Definition
Contour lines forming a valley are either U-shaped or V-shaped.
Term
What shape are the contour lines that indicate a Ridge?
Definition
Contour lines forming a ridge tend to be U-shaped or V-shaped. The closed end of the contour line points away from high ground.
Term
What shape are the contour lines that indicate a depression?
Definition
Usually only depressions that are equal to or greater than the contour interval will be shown. On maps, depressions are represented by closed contour lines that have tick marks pointing toward low ground.
Term
What shape are the contour lines that indicate a draw?
Definition
The contour lines depicting a draw are U-shaped or V-shaped, pointing toward high ground.
Term
What shape are the contour lines that indicate a spur?
Definition
Contour lines on a map depict a spur with the U or V pointing away from high ground.
Term
What shape are the contour lines that indicate a cliff?
Definition
Cliffs are also shown by contour lines very close together and, in some instances, touching each other.
Term
What must be done to a map before it can be used?
Definition
It must be oriented.
Term
What are 5 major terrain features found on a map?
Definition
Hill
Ridge
Valley
Saddle
Depression
Term
What are the 3 minor terrain features found on a military map?
Definition
Draw
Spur
Cliff
Term
What are the 2 supplementary terrain features found on a military map?
Definition
Cut
Fill
Term
What is a map?
Definition
A map is a graphic representation of a portion of the earth’s surface drawn to scale, as seen from above.
Term
What is an azimuth?
Definition
A horizontal angle, measured in a clockwise manner from a north base line, expressing direction.
Term
What is vertical distance?
Definition
The distance between the highest and lowest points measured.
Term
What is a contour interval?
Definition
The vertical distance between adjacent contour lines on a map.
Term
What is the distance between grid lines on a combat map?
Definition
1 kilometer or 1000 meters
Term
How many mils are there in a circle?
Definition
6400 mils in 360 degrees
Term
Which north is used when using a military map?
Definition
Magnetic north when using a compass, and grid north when using the map
Term
How would you hold a lensatic compass?
Definition
Away from metal (weapons, electrical devices), level and firm
Term
Name two ways to hold a compass?
Definition
Compass-to-Cheek Method
Center-Hold Method
Term
Are topographic symbols drawn to scale?
Definition
No
Term
What do topographic symbols represent?
Definition
Man-made and natural features
Term
In military symbols, what colors are used for a map overlay and what do they represent?
Definition
Blue- Friendly forces
Red-Enemy forces
Black- boundaries
Yellow-contaminated area both friendly and enemy
Green- engineer obstacles, both friendly and enemy
Term
What is Back Azimuth?
Definition
The opposite direction of an azimuth.
Term
How do you figure out a back azimuth?
Definition
To obtain a back azimuth from an azimuth, add 180 degrees if the azimuth is 180 degrees or less; subtract 180 degrees if the azimuth is 180 degrees or more
Term
What is a declination diagram?
Definition
Shows the angular relationship between the magnetic north, grid north and true north
Term
What is the general rule for reading military grid coordinates?
Definition
Right and UP
Term
What is a benchmark?
Definition
A man-made marker showing points of elevation
Term
What does UTM stand for?
Definition
Universal Transverse Mercator
Term
The lensatic compass has a bezel ring; each bezel ring click is equal to how many degrees?
Definition
3
Term
How many times would the bezel ring click if it were fully rotated?
Definition
120
Term
Large cities on a map are represented by what color?
Definition
Black
Term
Name two ways to orient a map?
Definition
Use a compass and terrain association
Term
What is the Field Manual for Operational Terms and Graphics?
Definition
FM 1-02
Term
The arrow on a compass always points what direction?
Definition
Magnetic north
Term
What does the term FLOT mean?
Definition
Forward Line Of Troops
Term
What's a topographic map?
Definition
Portrays terrain and land forms in a measurable way as well as horizontal features of the positions represented
Term
What does the term intersection mean?
Definition
Finding the location of an unknown point by sighting two or more known points
Term
Why is a map so important?
Definition
When used correctly, a map can give you accurate distances, locations and heights, best routes key terrain features and cover and concealment information.
Term
What does the term resection mean?
Definition
Resection is the method of locating one’s position on a map by determining the grid azimuth to at least two well-defined locations that can be pinpointed on the map.
Term
If you find a symbol on a map that is unknown to you, where would you look?
Definition
The marginal data, located on the outside lower portion of the map
Term
How many scales are there on a compass, what are they?
Definition
There are two;

Degrees
Mils
Term
What are the 4 quadrants on a map?
Definition
Northeast
Southeast
Northwest
Southwest
Term
What are the three elements for a land navigation process known as Dead Reckoning?
Definition
Known starting point
Known distance
Known azimuth
Term
What is the feature that makes the lensatic compass work well at night?
Definition
The dials and needles are luminous
Term
What is a polar coordinate?
Definition
Plotting or locating an unknown point using an azimuth and a distance from a known starting point
Term
What is the name of the map system that the U.S. uses?
Definition
Universal Transverse Mercator
Term
On a lensatic compass there are two rings, an outer black ring and an inner red ring, what are they used for?
Definition
The inner red ring is used to find degrees, and the outer black ring is used to find mils
Term
Name 3 field expedient methods of determining direction
Definition
The shadow-tip method, the watch method, and the North Star method
Term
What is a contour level?
Definition
It is the vertical distance between contour lines. The amount of the contour level is located in the Marginal Information on the map.
Term
You must find at least how many known locations on a map and the actual ground in order to plot your location accurately?
Definition
At least 2
Term
What are two methods of measuring an azimuth?
Definition
Compass and a protractor
Term
What would you use on a map to measure actual ground distance? 
Definition
The bar scale
Term
How close will an eight-digit grid get you to your point?
Definition
10 meters
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