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Board > Map Reading/Land Navigation (TC 3-25.26) > Flashcards

Map Reading/Land Navigation (TC 3-25.26) Flashcards

1
Q

What are the basic colors of a map, and what does each color represent?

A
  • 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.
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2
Q

What are military symbols?

A

Figures used to represent types of military organizations, installations, and activities

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3
Q

Where is the Legend of the map found?

A

Lower left margin

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4
Q

What are contour lines?

A

Imaginary lines on the ground connecting equal elevation, they represent high and low ground elevation.

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5
Q

What are 3 types of contour lines?

A
  1. Index
  2. Intermediate
  3. Supplementary
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6
Q

How many Mils are in one Degree?

A

17.7 mils

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7
Q

How many Norths are there on a military map?

A

Three:
1. True north
2. Magnetic north
3. Grid north

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8
Q

What must be done to a map before it can be used?

A
  • It must be oriented.
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9
Q

What are 5 major terrain features found on a map?

A
  1. Hill
  2. Ridge
  3. Valley
  4. Saddle
  5. Depression
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10
Q

What are the 3 minor terrain features found on a military map?

A
  1. Draw
  2. Spur
  3. Cliff
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11
Q

What are the 2 supplementary terrain features found on a military map?

A
  1. Cut
  2. Fill
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12
Q

What is a map?

A
  • A map is a graphic representation of a portion of the earth’s surface drawn to scale, as seen
    from above.
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13
Q

What is an azimuth?

A
  • A horizontal angle, measured in a clockwise manner from a north base line, expressing direction.
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14
Q

What is vertical distance?

A
  • The distance between the highest and lowest points measured.
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15
Q

What is a contour interval?

A
  • The vertical distance between adjacent contour lines on a map.
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16
Q

What is the distance between grid lines on a combat map?

A
  • 1 kilometer or 1000 meters
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17
Q

How many mils are there in a circle?

A
  • 6400 mils in 360 degrees
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18
Q

Which north is used when using a military map?

A

Magnetic north when using a compass, and grid north when using the map

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19
Q

How would you hold a lensatic compass?

A
  • Away from metal (weapons, electrical devices), level and firm
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20
Q

Name two ways to hold a compass?

A
  1. Compass-to-Cheek Method
  2. Center-Hold Method
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21
Q

Are topographic symbols drawn to scale?

A

no

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22
Q

What do topographic symbols represent?

A
  • Man-made and natural features
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23
Q

In military symbols, what colors are used for a map overlay and what do they represent?

A
  • Blue- Friendly forces
  • Red-Enemy forces
  • Black- boundaries
  • Yellow-contaminated area both friendly and enemy
  • Green- engineer obstacles, both friendly and enemy
24
Q

What is Back Azimuth?

A
  • The opposite direction of an azimuth.
25
Q

How do you figure out a back azimuth?

A
  • 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
26
Q

What is a declination diagram?

A
  • Shows the angular relationship between the magnetic north, grid north and true north
27
Q

What is the general rule for reading military grid coordinates?

A
  • Right and UP
28
Q

How many sights does a compass have?

A

2

29
Q

What is a benchmark?

A
  • A man-made marker showing points of elevation
30
Q

The lensatic compass has a bezel ring; each bezel ring click is equal to how many degrees?

A

3

31
Q

How many times would the bezel ring click if it were fully rotated?

A

120

32
Q

Name two ways to orient a map?

A
  • Use a compass and terrain association
33
Q

The arrow on a compass always points what direction?

A
  • Magnetic north
34
Q

What does the term FLOT mean?

A
  • Forward Line Of Troops
35
Q

What s a topographic map?

A
  • Portrays terrain and land forms in a measurable way as well as horizontal features of the positions represented
36
Q

What is a small-scale map?

A
  • Those maps with scales of 1:1,000,000 and smaller are used for general planning and for strategic studies. The standard small-scale map is 1:1,000,000. This map covers a very large land area at the expense of detail.
37
Q

What is a medium-scale map?

A
  • Those maps with scales larger than 1:1,000,000 but smaller than 1:75,000 are used for operational planning. They contain a moderate amount of detail, but terrain analysis is best done with the large-scale maps described below. The standard medium-scale map is 1:250,000. Medium scale maps of 1:100,000 are also frequently encountered.
38
Q

What is a large-scale map?

A
  • Those maps with scales of 1:75,000 and larger are used for tactical, administrative, and logistical planning. These are the maps that you as a soldier or junior leader are most likely to encounter. The standard large-scale map is 1:50,000; however, many areas have been mapped at a scale of 1:25,000.
39
Q

What does the term intersection mean?

A
  • Finding the location of an unknown point by sighting two or more known points
40
Q

Why is a map so important?

A
  • When used correctly, a map can give you accurate distances, locations and heights, best routes key terrain features and cover and concealment information.
41
Q

What does the term resection mean?

A
  • 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.
42
Q

If you find a symbol on a map that is unknown to you, where would you look?

A
  • The marginal data, located on the outside lower portion of the map
43
Q

How many scales are there on a compass, what are they?

A

There are two:
1. Degrees
2. Mils

44
Q

What are the 4 quadrants on a map?

A
  1. Northeast
  2. Southeast
  3. Northwest
  4. Southwest
45
Q

What are the three elements for a land navigation process known as Dead Reckoning?

A
  1. Known starting point
  2. Known distance
  3. Known azimuth
46
Q

What is the feature that makes the lensatic compass work well at night?

A
  • The dials and needles are luminous
47
Q

On a lensatic compass there are two rings, an outer black ring and an inner red ring, what are they used for?

A
  • The inner red ring is used to find degrees, and the outer black ring is used to find mils
48
Q

Name 3 field expedient methods of determining direction

A
  • The shadow-tip method, the watch method, and the North Star method
49
Q

What is a contour level?

A
  • It is the vertical distance between contour lines. The amount of the contour level is located in the Marginal Information on the map.
50
Q

Name the different slopes found on a map.

A
  1. Gentle
  2. Steep
  3. Concave
  4. Convex
51
Q

You must find at least how many known locations on a map and the actual ground in order to plot your location accurately?

A
  • At least 2
52
Q

What are the three main map sizes?

A
  1. Small
  2. Medium
  3. Large
53
Q

What are two methods of measuring an azimuth?

A
  • Compass and a protractor
54
Q

How close will an eight-digit grid get you to your point?

A
  • 10 meters
55
Q

How close will a six-digit grid coordinate get you to your point?

A
  • 100 meters
56
Q

What would you use on a map to measure actual ground distance?

A
  • The bar scale

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