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40 Cards in this Set
- Front
- Back
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What document covers map reading and land navigation?
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FM 3-25.26
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What is a map?
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A graphic representation of the Earth's surface drawn to scale as seen from above.
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What is the purpose of a map?
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To provide accurate information about the existance, location and distance between ground features like terrain, elevation, populated areas, routes of travel and communication.
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What is the scale of a map?
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The ratio of ground distance to map distance and expressed in a fraction.
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How many map scales are there and what are their names?
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Three: small, medium, and large.
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Name several types of maps.
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Topographic, planimetric, photomap, and terrain model.
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What is a topographic map?
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A map that portrays the layout of terrain features, as well as relief, or the vertical distance of the feature.
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What is a photomap?
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An aerial photograph of a portion of the earth's surface on which grid lines, place names, and approximate scale and direction have been added.
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What is a planimetric map?
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A map that only shows the horizontal positions of features. It differs from a topographic map in that it omits relief, usually represented by contour lines.
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What is marginal information/
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Instructions about the maps use, size, area.
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Where is the map sheet name found/
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Two places: the center of the upper margin and either the right or left side lower margin.
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What is a map usually named after?
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The most prominent geographical or cultural feature. whenever possible it is named after the largest city on the map.
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Where is the map sheet number found?
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In two places: the upper right and lower left margins.
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Where is the map series name found?
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The upper right and lower left margins.
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Where is the scale of the map found?
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In the upper left margin after the series name, and in the lower margin at the center.
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Where is the edition mumber of a map found?
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The upper margin and in the lwoer left margin. It represents the age of the map- the higher the number the more recent the edition of hte map.
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Where is the declination diagram found/
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The lower margin of large-scale maps.
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What is the declination diagram?
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It shows the angular relationships of true north, grid north and magnetic north.
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Where are the bar scales of a map located?
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In the center of the lower margin.
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What is a bar scale/
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A ruler used to convert map distance to ground distance.
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What are the usual three units of measure in a bar scale?
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They are meters, statute miles, and nautical miles.
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Where is the contour interval note found?
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Usually below the bar scales in the middle of the lower margin.
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What is contour interval?
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The vertical distance of the space between the contour lines. In more recent maps that distance or space is given in meters instead of feet.
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Where is the legend of a map found?
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In the lower left margin
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What is in a map legend?
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The symbols that represent topographic features.
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How many colors does a map usually have?
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5
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What are the colors?
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Black, blue, green, brown, red.
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What do the colors of a map represent?
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Black-man made features.
Blue-water Green-vegetation. Brown-relief features and elevation. Red-cultural features such as populated areas. |
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What is longitude?
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A measure of distance east or west of the prime meridian.
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In what city is the prime meridian?
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Greenwich, England.
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In which direction are the lines of longitude drawn on a map?
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North and south.
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lines of longitude are also known as what?
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Meridians.
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What is latitude?
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The measure of distance north or south of the equator.
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What is the starting point for latitude?
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The equator.
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Lines of latitude are also known as what?
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Parallels.
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What type of map system does the US military use?
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UTM The Universal Transverse Mercator
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What portion of the world is a UTM map designated for?
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That part of the world between Lat 84 degrees North, and Lat 80 degrees south.
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What is the basic rule for finding coordinates on a map?
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Starting from the lower left corner, read right then up.
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How close will you get to a location with a four, six and eight digit grid coordinate?
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4-1000 meters
6-100 meters 8-10 meters |
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Name three types of contour lines.
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Index, intermediate, supplementary
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