Tactical Tools (Corporal's Course)
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Terms in this set (145)
A map is defined as a graphic representation of a portion of the Earth's
surface drawn to scale, as seen from above. It uses
colors, symbols, and labels to represent features
found on the ground.
-The ideal representation would be realized if
every feature of the area being mapped could be
shown in true shape.
-The purpose of a map is to provide information on
the existence, location, and 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.
-All operations conducted require maps; however,
the finest maps available are worthless unless the
map user knows how to read them.
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Marginal Information A map is considered equipment. To use it properly,
you should read the instructions.
These instructions on the outer edges of the map
are called marginal information.
All maps are different so examine the marginal
information on each map carefully.
Marginal Information (Top Margin 1- The top margin of the map helps you to identify the
6) specific area covered as well as the age and scale
of the map.
1 Sheet Name (Top Margin) The sheet name is found in bold print at the center
of the top and in the lower left area of the map
margin. A map is generally named for the
settlement contained within the area covered by
the sheet or for the largest natural feature located
within the area at the time the map was drawn.
2 Sheet Number (Top Margin) The sheet number is bolded in the upper right and
lower left areas of the margin and in the center box
of the adjoining sheets diagram, which is found in
the lower right margin.
It is used as a reference number to link specific
maps to overlays, operations orders, and plans.
For maps at 1:100,000 scale and larger, sheet
numbers are based on an arbitrary system that
makes possible the ready orientation of maps at
scales of 1:100,000, 1:50,000, and 1:25,000.
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3 Series Name (Top Margin) The map series name is found in the same bold
print as the sheet number in the upper left corner
of the margin.
The name given to the series is generally that of a
major political subdivision, such as a state within
the United States or a European nation.
A map series usually includes a group of similar
maps at the same scale and on the same sheet
lines or format designed to cover a particular
geographic area.
It may also be a group of maps that serve a
common purpose, such as the military city maps.
4 Scale (Top Margin) The scale is found both in the upper left margin
after the series name and in the center of the lower
margin.
The scale note is a representative fraction that
gives the ratio of a map distance to the
corresponding distance on the Earth's surface.
For example, the scale note 1:50,000 indicates that
one unit of measure on the map equals 50,000
units of the same measure on the ground.
5 Series Number (Top Margin) The series number is found in both the upper right
margin and the lower left margin. It is a sequence
reference expressed either as a four-digit numeral
(1125) or as a letter, followed by a three- or four-
digit numeral (M661; T7110).
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6 Edition Number (Top Margin) The edition number is found bolded in the upper
right area of the top margin and the lower left area
of the bottom margin.
Editions are numbered consecutively; therefore, if
you have more than one edition, the highest
numbered sheet is the most recent.
This date is important when determining how
accurately the map data might be expected to
match what you will encounter on the ground.
Marginal Information (Bottom Margin This portion of the map includes information that
7-14) helps to interpret the map. It provides correlation
between actual terrain and man-made features and
the map's topographic symbols. Some information
found in the bottom margin is repeated from the
top margin.
7 Boundaries (Bottom Margin) The index to boundaries diagram appears in the
lower or right margin of all sheets.
This diagram, which is a miniature of the map,
shows the boundaries that occur within the map
area, such as county lines and state boundaries.
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