Army Land Navigation Flashcards

Questions and Answers

What are the basic colors of a map and what do they represent? (Select all that apply)

Red-brown (correct)

Blue (correct)

Black (correct)

Brown (correct)

Red (correct)

Where is the legend on a map found?

Lower left corner.

What are contour lines?

Imaginary lines on the ground connecting equal elevation.

What are the three types of contour lines?

Index, Intermediate, Supplementary. Signup and view all the answers

How many mils are in a degree?

17.7 mils. Signup and view all the answers

How many norths are there on a military map?

True north, Magnetic north, Grid north. Signup and view all the answers

What are the 5 major terrain features?

Hill, Valley, Ridge, Saddle, Depression. Signup and view all the answers

What are the three minor terrain features?

Draw, Spur, Cliff. Signup and view all the answers

What are the two supplementary features?

Cut, Fill. Signup and view all the answers

What is a map?

A graphic representation of a portion of the Earth's surface drawn to scale. Signup and view all the answers

What is an azimuth?

A horizontal angle measured in a clockwise manner from a north baseline. Signup and view all the answers

What is a vertical distance?

The distance between the highest and lowest points measured. Signup and view all the answers

What is the distance between grid lines?

1 kilometer. Signup and view all the answers

How many mils are in a circle?

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Which north is used when using a map, and when using a compass?

Grid north for a map and magnetic north for a compass. Signup and view all the answers

Name two ways to hold a compass.

Compass-to-cheek method, Center-hold method. Signup and view all the answers

What colors are used on a map overlay? (Select all that apply)

Red Signup and view all the answers

What is a back azimuth?

The opposite direction of an azimuth. Signup and view all the answers

What is a declination diagram?

It shows the angular relationship between magnetic, grid, and true north. Signup and view all the answers

What is the general rule for reading military grid coordinates?

Right and up. Signup and view all the answers

What is a benchmark?

A man-made marker showing points of elevation. Signup and view all the answers

The lensatic compass has a bezel ring; each click of the bezel ring equals how many degrees?

3 degrees. Signup and view all the answers

What are two ways to orient a map?

Compass, Terrain association. Signup and view all the answers

What does FLOT mean?

Forward Line of Troops. Signup and view all the answers

What does intersection mean?

Finding a location by the intersection of two azimuths. Signup and view all the answers

What is resection?

Finding your location by using the interaction of two back azimuths from two known points. Signup and view all the answers

What are the four quadrants of a map?

Northeast, Northwest, Southeast, Southwest. Signup and view all the answers

What three things are needed for dead reckoning?

Known starting point, Known distance, Known azimuth. Signup and view all the answers

What is a polar coordinate?

Plotting a point using an azimuth and a distance from a known starting point. Signup and view all the answers

The border line around the edge of the map is called what?

The neat line. Signup and view all the answers

What is the contour level?

It is the vertical distance between contour lines. Signup and view all the answers

What are the types of slopes?

Gentile, Steep, Concave, Convex. Signup and view all the answers

How close will an 8-digit grid get you to your point?

10 meters. Signup and view all the answers

How close will a 6-digit grid get you to your point?

100 meters. Signup and view all the answers

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

The bar scale. Signup and view all the answers

What does MGRS stand for?

Military Grid Reference System. Signup and view all the answers

What does UTM stand for?

Universal Transverse Mercator. Signup and view all the answers

What does UPS stand for?

Universal Polar Stereographic. Signup and view all the answers

Study Notes

Basic Map Colors and Their Meanings

Black: Represents man-made features.
Red-brown: Indicates cultural features and relief features, including contour lines.
Blue: Depicts water features.
Brown: Shows relief features.
Red: Highlights population areas, main roads, and boundaries.

Map Legend

Located in the lower left corner of the map.

Contour Lines

Imaginary lines that connect points of equal elevation, used to represent high and low elevations.

Types of Contour Lines

Index: The primary contour lines, typically labeled with elevation values.
Intermediate: Lines between index lines, not labeled but provide detail.
Supplementary: Often dotted or dashed, indicating additional elevation detail.

Measurement and Angles

1 degree equals 17.7 mils.
A complete circle is 6400 mils.

North Directions on Military Maps

True North: Based on Earth's geographic poles.
Magnetic North: The direction a compass points.
Grid North: Based on the vertical grid lines on maps.

Major Terrain Features

Hill: Elevated ground.
Valley: Low area between hills.
Ridge: Long, narrow elevated land.
Saddle: A dip in a ridge.
Depression: Lower area on the terrain.

Minor Terrain Features

Draw: A small, narrow valley.
Spur: A projection or point of higher ground.
Cliff: Steep vertical or near-vertical rock face.

Supplementary Features

Cut: Feature where earth has been removed.
Fill: Earth that is added to raise elevation.

Map Definition

A graphical representation of a portion of the Earth's surface, depicted from an aerial viewpoint and drawn to scale.

Azimuth

A horizontal angle measured clockwise from a north baseline, indicating direction.

Vertical Distance

The distance between the highest and lowest points.

Grid Lines

Distance between grid lines on a military map is 1 kilometer.

Map and Compass Usage

Grid north is used with maps, while magnetic north is utilized with compasses.
Two methods to hold a compass: Compass-to-cheek and Center-hold.

Map Overlays Colors

Blue: Friendly forces.
Red: Enemy forces.
Black: Boundaries.
Yellow: Contaminated areas.
Green: Engineer obstacles.

Back Azimuth

The direction opposite to an azimuth.

Declination Diagram

Illustrates the angular relationship between magnetic, grid, and true north.

Military Grid Coordinates

Read coordinates by moving right and up.

Benchmark

A man-made marker indicating elevation points.

Lensatic Compass Bezel Ring

Each click of the bezel ring corresponds to 3 degrees.

Map Orientation

Can be oriented using a compass or terrain association.

FLOT

Acronym for Forward Line of Troops.

Intersection

Locating a point using the intersection of two azimuths.

Resection

Determining location using back azimuths from two known points.

Map Quadrants

Divided into Northeast, Northwest, Southeast, and Southwest quadrants.

Dead Reckoning

Requires a known starting point, known distance, and known azimuth.

Polar Coordinates

Plotting utilizes an azimuth and distance from a known starting point.

Neat Line

The border line surrounding the edge of the map.

Contour Level

Vertical distance between contour lines, found in marginal information.

Types of Slopes

Gentile: Gradual slope.
Steep: Sharp incline.
Concave: Curves inward.
Convex: Curves outward.

Grid Accuracy

An 8-digit grid provides accuracy to 10 meters.
A 6-digit grid provides accuracy to 100 meters.

Measuring Ground Distance on a Map

Use a bar scale for measuring actual distances.

Military Geographic Acronyms

MGRS: Military Grid Reference System.
UTM: Universal Transverse Mercator.
UPS: Universal Polar Stereographic.

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Description

Test your knowledge of essential map reading skills with these Army Land Navigation flashcards. Learn about the colors and symbols used on maps, their meanings, and other important navigation concepts. This quiz will help you gain confidence in your land navigation abilities.