MSL101L04 Basic Map Reading SR.pdf lesson 4.pdf

Legend 23 the legend is located in the lower left

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Legend (23). The legend is located in the lower left margin. It illustrates and identifies the topographic symbols used to depict some of the more prominent features on the map. The symbols are not always the same on every map. Always refer to the legend to avoid errors when reading a map.
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Chapter 3 3-4 TC 3-25.26 15 November 2013 Figure 3-1. Topographical map A DDITIONAL N OTES 3-2. Not all maps contain the same items of marginal information. Under certain conditions, special notes and scales may be added to aid the map user. Glossary. The glossary is an explanation of technical terms or a translation of terms on maps of foreign areas where the native language is other than English. Classification. Certain maps require a note indicating the security classification. This is shown in the upper and lower margins. Protractor scale . The protractor scale may appear in the upper margin on some maps. It is used to lay out the magnetic-grid declination for the map, which, in turn, is used to orient the map sheet with the aid of the lensatic compass. Coverage diagram . On maps at scales of 1:100,000 and larger, a coverage diagram may be used. It is normally in the lower or right margin and indicates the methods by which the map was made, dates of photography, and reliability of the sources. On maps at 1:250,000-scale, the coverage diagram is replaced by a reliability diagram. Special notes (24). A special note is a statement of general information that relates to the mapped area. It is normally found in the lower right margin. For example, a particular note could be “this map is red-light readable.” User’s note (25). The user’s note is normally located in the lower right-hand margin. It requests cooperation in correcting errors or omissions on the map. Errors should be marked and the map forwarded to the agency identified in the note. Stock number identification (26). All maps published by the NGA that are in the Department of the Army map supply system contain stock number identifications that are used in requisitioning map supplies. The identification consists of the words “STOCK NO” followed by a unique designation that is composed of the series number, the sheet number of the individual map, and on recently printed sheets, the edition number. The designation is limited to 15 units
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Marginal Information and Symbols 15 November 2013 TC 3-25.26 3-5 (letters and numbers). The first 5 units are allotted to the series number; when the series number is less than 5 units, the letter “X” is substituted as the fifth unit. The sheet number is the next component; however, Roman numerals, which are part of the sheet number, are converted to Arabic numerals in the stock number. The last 2 units are the edition number; the first digit of the edition number is a zero if the number is less than 10. If the current edition number is unknown, the number 01 is used. The latest available edition is furnished. Asterisks are placed between the sheet number and the edition number when necessary to ensure there are at least 11 units in the stock number.
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