MSL101L04 Basic Map Reading SR.pdf lesson 4.pdf

On a 1250000 scale map the prescribed symbol for a

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On a 1:250,000-scale map, the prescribed symbol for a building covers an area about 500 square feet on the ground; a road symbol is equivalent to a road about 520 feet wide on the ground; the symbol for a single- track railroad (the length of a cross-tie) is equivalent to a railroad cross-tie about 1,000 feet on the ground. 2-3. The portrayal of many features requires similar exaggeration. Therefore, the selection of features shown, as well as their portrayal, is according to the guidance established by the National Geospatial- Intelligence Agency (NGA). P URPOSE 2-4. A map provides information on the existence of the location and the distance between ground features, such as populated places and routes of travel, and communication. It also indicates variations in terrain, heights of natural features, and the extent of vegetation cover. With our military forces dispersed throughout the world, it is necessary to rely on maps that provide information to our combat elements and resolve logistical operations far from our shores. Planning using maps allows units to transport, store, and place Soldiers and materiel into operation at the proper time and location. All operations require maps; however, the finest maps available are worthless unless the map user knows how to read them.
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Maps 15 November 2013 TC 3-25.26 2-3 C ARE 2-7. Maps are documents printed on paper that requires protection from water, mud, and tearing. Whenever possible, carry maps in a waterproof case, pocket, or some other place where it is handy for use but still protected. (Appendix A shows two ways to fold a map.) Other considerations include: Take care when using a map since it may have to last a long time. Use a pencil if marking a map becomes necessary. Use light lines to make erasing easier without smearing, smudging, or leaving marks that may cause confusion later. If trimming map margins is necessary, it is essential to note marginal information such as grid data and magnetic declination for possible future use. Take special care when using a map in a tactical mission, especially in small units; the mission may depend on that map. All members of such units should know the map’s location at all times. CATEGORIES OF MAPS 2-8. The NGAs mission is to provide mapping, charting, and all geodesy support to the armed forces, and all other national security operations. NGA produces four categories of products and services: hydrographic, topographic, aeronautical, and digital. Military maps are categorized by scale and type. 2-9. Knowing the mathematical scale used is important to the user. The scale determines the ground distance between objects or locations on the map, the size of the area covered, and the amount of detail being shown. The mathematical scale of a map is the ratio or fraction between the distance on a map and the corresponding distance on the surface of the earth. The representative fraction (RF) is the scale, with the map distance as the numerator and the ground distance as the denominator.
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