TACT 3006

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TACT 3006 LAND NAV II
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-Marginal Information -Colors of a Map -Grid
Squares/Coordinates -Measuring Distance -Prac App
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• A topographic map is a mathematically determined
  representation of a portion of the earth's
  surface systematically plotted to scale on a
  plane surface.

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• MARGINAL INFORMATION

• The information on the back of a map which helps
  us read and interpret a map.

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• Marginal information consists of

• Graphic (bar) scales.
• Declination diagram.
• Representative fraction.

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REPRESENTATIVE FRACTION
DECLINATION DIAGRAM
GRAPHIC BAR SCALE
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• Representative fraction (rf)
• is the ratio of horizontal distance on the map to
  the corresponding horizontal distance on the
  ground.

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Representative fractionindicates the size and
detail of the map.
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Map Scales
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• 1/8 1/4 1/2 MD/GD
• A denominator of a lower value indicates a larger
  scale map.

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• SMALL SCALE
• 11,000,000
• AND
• SMALLER

• Used for general planning and high echelon
  strategic studies.
• The standard small scale map is 11,000,000.

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• MEDIUM SCALE
• LARGER THAN 11,000,000
• BUT
• SMALLER THAN 175,000

• Used for planning of operations, concentration of
  troops and supplies.
• The standard medium scale map is 1250,000.

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• LARGE SCALE
• 175,000
• AND LARGER

• Used for tactical, technical and administrative
  needs of field units.
• The standard large scale map is 150,000.
• Your OCS maps are 125,000 scale maps.

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• Graphic (bar) scales are used to convert map
  distance.

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Consists of different units of measure.
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Primary scale - full units of measure.
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Extension scale- usually tenths of units of
measure.
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• DECLINATION DIAGRAM

• Indicates the angular relationship of the three
  norths.

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• 3 TYPES OF NORTH

• TRUE NORTH - A line from any position on the
  surface to the north pole. ()
• MAGNETIC NORTH - The direction to the north
  magnetic pole.(arrow)
• GRID NORTH - The north that is established by the
  vertical grid lines on the map. (Gn or y)

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COLORS
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• Colors show a contrast between the different
  features on a map providing a natural and
  realistic appearance.

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• BLACK

-The majority of cultural or man-made features.
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• BLUE

-Water features such as lakes, rivers, and swamps.
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• GREEN

-Vegetation such as woods, orchards, and
vineyards.
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• BROWN

-All relief features such as contours.
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• RED

-Main roads, built up areas, and special features.
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GRIDS
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• DEFINITION OF A GRID LINES

-A series of straight lines intersecting at right
angles and forming a series of squares.
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• PRINCIPLE DIGITS

• Two digits that appear at the end of each grid
  line.
• Occur at intervals along the grid lines across
  the face of the map.

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VERTICAL GRID LINES
Function as eastern and western boundary.
POT OT MOTTOB
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HORIZONTAL GRID LINES
LEFT SIDE TO RIGHT SIDE
Function as southern and northern boundary.
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THE BASIC MAP READING RULE

• READ RIGHT

• THEN UP

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• The coordinates of a grid square are found by
  combining the values of the vertical and
  horizontal grid lines that form the lower
  left-hand corner of the grid square.

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FINDING A 4 DIGIT GRID
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4-DIGIT GRID COORD. 97/63
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• Four digit grid coordinate gets you to within
  1000 square meters of a point.
• We can get closer!!!

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COORDINATE SCALE
Divides a grid square more accurately.
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• Six digit grid coordinate gets you to within 100
  square meters of a point.
• Eight digit grid coordinate gets you to within 10
  square meters of a point.

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6 digit grid coordinate97 _ 63 _
97
98
96
64
X
63
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6 digit grid coordinate97 _ 63 _
97
X
63
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9 76 3
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6 digit grid coordinate 97 _ 63 _
97
X
63
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97 _ 63 _
974 63
974 637
97
X
63
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9 7 4 6 3 7
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97
X
63
62
97
97_ _ 63_ _
X
63
63
97
9738 63_ _
9738 636 7
97_ _ 63_ _
X
63
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9 7 3 8 6 3 6 7
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-Place Protractor -Turn Protractor (Red X) -Slide
Right -Reference Horizontal -Reference Vertical
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Locating points within a grid square given a grid
coordinate.
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Finding a 6 digit grid for a certain point
983 634
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Finding a 8 digit grid for a certain point
9834 6336
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MEASURING DISTANCE
DISTANCE SCALE
READ THE FINE PRINT!!!!
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• STRAIGHT LINE DISTANCE

• "As the crow flies
• Lay a straight piece of paper on the map so that
  the edge of paper touches both points.
• Make tick marks on paper at each point.

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• CONT.

• Move paper to the graphic bar scale and read the
  ground distance between the two points.
• First determine the full units of measure on the
  primary scale. Then determine the remaining
  tenths of units of measure on the extension
  scale.
• Use the scale that measures in the unit of
  measure desired.

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• IRREGULAR DISTANCE

• To measure distance along a winding road, stream,
  or any other curved line.
• Make a tick mark on one end of the paper and
  place it at the point from which the curved line
  is to be measured.
• Align the edge of the paper along a straight
  portion, and make a tic mark on both map and
  paper at the end of the aligned position. For
  accuracy of measurement of the distance make tic
  marks at any point that the straight edge of the
  paper leaves the center of the road, trail, or
  stream.

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LETS TAKE A BREAK.
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• LN II PRAC APP

• What is marginal information?
• Supplies information that allows us to read and
  interpret a map.
• What is the basic map reading rule?
• Read right and then up.
• What is the eight digit grid coordinate for the
  monument benchmark in grid square 9562?
• 95296240

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• What is the eight digit grid coordinate of the
  southern most gravel pit in grid square 9763?
• 97686313

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• LN II PRAC APP

• What is located at grid
• coordinate 98206320?

• HELICOPTER LANDING ZONE

What is the 6-digit grid coordinate for the
rectory in grid square 9562?

• 950625

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• LN II PRAC APP

• What is located at 97336479?
• Waterand the C in the word CREEK.

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• LN II PRAC APP

• What is located at coordinate 98356515?
• POST CHAPEL
• What is located at coordinate 98606364
• BRIDGE

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• LN II PRAC APP

• What is located at coordinate 94926474?
• BUFFALO POND

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• LN II PRAC APP

• Using your graphic bar scale, what is the
  distance (in meters) from LZ OCS 2 (GS 95/63) to
  LZ OCS 1 (GS (98/63)?
• 2,480m

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• LN II PRAC APP

• Using the scale on your protractor, give the
  distance (meters) between GC 9628/6377 to GC
  9641/6262.
• 1,200m

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• LN II PRAC APP

• Using your graphic bar scale, give the irregular
  (curved-line) distance of the single track
  railroad in GS 98/64.
• 1,060m

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• QUESTIONS FROM THE CLASS?

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-Marginal Information -Colors of a Map -Grid
Squares -Plotting 6 and 8 Digit Grid
Coordinates -Measuring Distance