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### 25 Cards in this Set

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