TC 3-25.26 - Map Reading and Land Navigation Flashcards
(62 cards)
What is the Field Manual for the map reading and land navigation?
TC 3-25.26
What are the basic colors of a map, and what does each color represent?
Black— Indicates 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 a red-light readable maps.
Blue— Identifies hydrography or water features suck 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 map 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.
What are military symbols?
Figure used to represent types of military organizations, installations, and activities.
Where is the Legend of the map found?
Lower left margin.
What are contour lines?
Imaginary lines on the ground connecting equal elevation, they represent high and low ground elevation.
What are 3 types of contour lines?
1) Index
2) Intermediate
3) Supplementary
How many Mils are in one degree?
17.7 mils
How many North’s are there on a military map?
Three
True North
Magnetic North
Grid North
What shape are the contour lines that indicate a hill?
A hill is shown on a map by contour lines forming concentric circles. The inside of the smallest closed circle is the hilltop.
What shape are the contour lines that indicate a saddle?
A saddle is normally represented as an hourglass
What shape are the contour lines that indicate a valley?
Contour lines forming a valley are either U-Shaped or V-Shaped
What shape are the contour lines that indicate a ridge?
Contour lines forming a ridge tend to be a U-shaped or V-shaped. The closed end of the contour line points away from high ground.
What shape are the contour lines that indicate a depression?
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.
What shape are the contour lines that indicate a draw?
The contour lines depicting a draw are U-shaped or V-shaped, pointing toward high ground.
What shape are the contour lines that indicate a spur?
Contour lines on a map depict a spur with the U or V pointing away from high ground
What shape are the contour lines that indicate a cliff?
Cliffs are also shown by contour lines very close together and, in some instances, touching each other.
What shape are the contour lines that indicate a cut?
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.
What shape are the contour lines that indicate a fill?
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.
What must be done to a map before it can be used?
It used be oriented
What are the 5 major terrain features found on a map?
1) Hill
2) Ridge
3) Valley
4) Saddle
5) Depression
What are the 3 minor terrain features found on a military map?
1) Draw
2) Spur
3) Cliff
What are the 2 supplementary terrain features found on a military map?
1) Cut
2) Fill
What is a map?
A map is a graphic representation of a portion of the earth’s surface drawn to scale, as seen from above.
What is an azimuth?
A horizontal angle, measured in a clockwise manner from a north base line, expressing direction.
