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Officer Candidate School > Map Reading > Flashcards

Map Reading Flashcards

Flash cards for map reading skills.

1
Q

Black

A

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

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2
Q

Red-Brown

A

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.

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3
Q

Blue

A

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

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4
Q

Green

A

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

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5
Q

Brown

A

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

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6
Q

Red

A

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

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7
Q

Where is the Legend of the map found?

A

Lower left margin.

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8
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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9
Q

What are the 3 types of contour lines?

A

1) Index, 2) Intermediate, 3) Supplementary

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10
Q

How many Mils are in one Degree?

A

17.7 mils

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11
Q

How many North’s are there on a military map?

A

Three: 1) True North, 2) Magnetic North, 3) Grid North

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12
Q

What shape are contour lines that indicate a hill?

A

A hill is shown on a map by contour lines forming concentric circles. The inside of the smallest closed circle is the hilltop.

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13
Q

What shape are the contour lines that indicate a saddle?

A

A saddle is normally represented as an hourglass.

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14
Q

What shape are the contour lines that indicate a valley?

A

Contour lines forming a valley are either U-shaped or V-shaped.

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15
Q

What shape are the contour lines that indicate a ridge?

A

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.

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16
Q

What shape are the contour lines that indicate a depression?

A

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.

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17
Q

What shape are the contour lines that indicate a draw?

A

Contour lines on a map depict a spur with the U or V pointing away from high ground.

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18
Q

What shape are the contour lines that indicate a spur?

A

Contour lines on a map depict a spur with the U or V pointing away from high ground.

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19
Q

What shape are the contour lines that indicate a cliff?

A

Cliffs are also shown by contour lines very close together and, in some instances, touching each other.

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20
Q

What shape are the contour lines that indicate a cut?

A

This contour line extends the length of the cut and has tick marks that extend from the cut line to the roadbed, if the map scale permits this level of detail.

21
Q

What shape are the contour lines that indicate a fill?

A

This contour line extends the length of the filled area and has tick marks that point toward lower ground. If the map scale permits, the length of the fill tick marks are drawn to scale and extend from the base line of the fill symbol.

22
Q

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

A

It must be oriented.

23
Q

What are 5 major terrain features found on a map?

A
  1. Hill
  2. Ridge
  3. Valley
  4. Saddle
  5. Depression
24
Q

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

A
  1. Draw
  2. Spur
  3. Cliff
25
Q

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

A
  1. Cut

2. Fill

26
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.

27
Q

What is an azimuth?

A

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

28
Q

What is vertical distance?

A

The distance between the highest and lowest points measured.

29
Q

What is a contour interval?

A

The vertical distance between adjacent contour lines on a map.

30
Q

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

A

1 kilometer or 1000 meters

31
Q

How many mils are there in a circle?

A

6400 mils in 360 degrees

32
Q

Which north is used when using a military map?

A

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

33
Q

What is Back Azimuth?

A

The opposite direction of an azimuth.

34
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

35
Q

What is a declination diagram?

A

Shows the angular relationship between the magnetic north, grid north and true north

36
Q

What is the general rule for reading military grid coordinates?

A

Right and UP

37
Q

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

A

3

38
Q

The arrow on a compass always points what direction?

A

Magnetic north

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

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.

41
Q

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

A

There are two:

  1. Degrees
  2. Mils
42
Q

What are the 4 quadrants on a map?

A
  1. Northeast
  2. Southeast
  3. Northwest
  4. Southwest
43
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
44
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

45
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.

46
Q

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

A

10 Meters

47
Q

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

A

100 Meters

48
Q

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

A

The bar scale

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