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25 Cards in this Set
- Front
- Back
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Sheet name
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A map is named after the most prominent cultural or geographical feature.
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sheet number
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reference number for that map
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Scale
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1:50,000 equals 50,000 inches on the ground. 1:25,000 more detailed that the 1:50,000.
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Declination Diagram
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Indicates the angular relationships of true north, grid north, and magnetic north.
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Bar scales
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convert map distance to ground distance.
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Grid Squares
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the most common military map contains grids squares that measure 1000 meters by 1000
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Basic Map Reading Rule
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Read right then up.
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A four digit grid coordinate
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point within 1000 meters
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a six digit grid coordinate
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point within 100 meters
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A eight digit grid coordinate
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point within 10 meters
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True North
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The true north line is a line from any point on the earth's surface to the North pole.
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Magnetic North
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The earth has a magnetic field that is close to (but not exactly on) the north pole.
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Grid North
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This base line is established by using the vertical grid lines on the map.
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Hill
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A hill is shown on a map by contour lines florming concentric circles.
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Ridge
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A ridge is a series of hills that are connected to each other near the top.
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Saddle
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This is a dip or low point between two area of higher ground.
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Finger/Spur
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A finger is a short continuous sloping line of higher ground normally jutting out from the side of a ridge or hill. Often formed by two roughly parallel draws.
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Draw
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A draw is a short. continuous sloping line of low ground, normally cut into the side of a ridge hill.
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Depression
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This is a low point in the ground or a sinkhole.
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Lensatic compass
degrees/mil |
To convert degrees ro mils, multiply degrees by 17.78
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Azimuths
grid |
protrator
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azimuths
magnetic |
compass
G M Angle varies on every map. |
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Azimuth
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To convert a magnetic azimuth to a grid azimuth add GM angle.
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Map Orientaion
Compass |
Map flat on the ground
Keep compass aligned |
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Map Orientation
Terrian association |
Identify prominent terrain fetures
Aligh terrain features with the map |
