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35 Cards in this Set
- Front
- Back
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What is marginal information used for?
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Identification-which area covered
Interpretation-correlation between actual terrain and and map Evaluation-helps determine validity of info represented on map |
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What information is listed in the margin (15)?
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Sheet Name
Series and Sheet number Series Name Scale Edition Number Index to Ajoining sheets and Boundaries Elevation Guide Declination Diagram Bar Scales Counter Interval Note Legend Grid Reference Box Stock Number |
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Sheet Name
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Describes most significant feautre on the map
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Series and Sheet Number
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For organization and accounting purposes--sheet is for specific map, series is for numerous maps
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Series Name
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Collection representing specific geographical area
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Scale
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ratio of map to real world
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Edition Number
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production version number; high number means more recent map (DMA and NIMA)
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Index to Adjoining Sheets and Boundaries
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Displays sheet and series numbers for areas adjacent and shows political boundaries
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Elevation Guide
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general overview of elevation of terrain on the map
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Declination Diagram
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provides reference for declinations of grid North and magnetic north from True North
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Bar Scales
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show straight line distances in kilos, statute and nautical miles
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Contour Interval note
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describes elevation chance between consecutive contour lines.
horizontal datum indicates the collection of data from which the grid ref. system is based. ALWAYS CHECK HORIZONTAL. Vertical datum indicates collection of data from which elevation data is based. |
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Legend
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provides the key for interpreting the map symbols
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Grid Reference Box
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provides information indicating 100,000 meter grid square identifier and grid zone designator for a particular map, as well as info on plotting specific points to 100 m accuracy.
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Stock Number
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Used to reorder maps from NIMA.
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Black:
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man made features
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Brown:
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terrain features**
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Green:
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vegetation
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Blue
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water
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Red:
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road conditions and built-up areas**
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What is the largest grid square on a map?
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6 degrees by 8 degrees
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Red
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Road conditions and built-up areas**
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Military Grid Reference System
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2 digits: precision of 10 km
4 digits: precision of 1 km 6 digits: precision of 100m 8 digits: precision of 10 m 10 digits: precision of 1 m |
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Grid coordinates are broken down into:
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100,000 meter squares named by 2 letters
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To map a point:
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go RIGHT then UP
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Examples:
18S TT |
Grid zone designation (this is Quantico)
100,000 meter grid square |
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What do you do if a point lies in a partial square?
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Reconstruct the entire square.
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What are the scales and their sizes?
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Large: 1:75,000 and large
Medium: 1:75,000-1:600,000 Small: 1:600,000 and smaller |
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Small unit leaders use what scales?
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Primarily small and some medium
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Large scale maps
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cover relatively small area
contain good detail are used for tactical purposesMe |
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Medium scale maps
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cover a larger area
contain less detail are used for stategic purposes and aerial navigation |
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Small Scale maps
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cover an extremely large area
contain almost no detail |
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Graphic Scale
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premeasured map distance corresponding to a certain ground distance. allows measurement by visual examination and avoids lengthy calculations
Parts are: primary scale and extension scale |
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Measuring Ground Distance:
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methodoly depends on straight-line vs. curved-line distance
distance does not account fore elevation changes |
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WGS-84
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Center point of the earth's mass based on World Geodetic System, less than 2 cm error
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