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38 Cards in this Set
- Front
- Back
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What is the sheet name usually named after?
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Prominent features on the map, largest city when possible.
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Where is the sheet name found?
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Center of upper margin, or right/left lower margin.
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What does the scale do?
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Ratio, corresponding distance from earth's surface to the map.
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Where and what is the sheet number?
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Reference number for map sheet. Upper right and lower left margin.
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What is the elevation guide?
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Mini characterization, giving you the big picture of what the terrain looks like.
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Where is the elevation guide typicall found?
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Lower right margin.
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What is the declination diagram?
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Shows the difference between grid, true, and magnetic north.
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Where is the declination diagram found?
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Center of the lower margin.
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What are the bar scales?
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Convert map distance to ground distance.
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Where are the bar scales found?
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Center of lower margin.
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What is the legend?
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Illustrates and identifies topographic symbols, such as roads, heliports, no fire zones, etc.
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What are grid lines?
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Lines that intersect at right angles to form squares.
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What digits appear on the grid lines?
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Principal digits, important for reference points.
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What is the most common measure of Grid Squares?
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1000meters X 1000meters
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What is the basic map reading rule?
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Read right on vertical, up on horizontal.
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Within how many meters will a 4, 6, and 8 digit grid get you?
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4 digit: 1000 meters
6 digit: 100 meters 8 digit: 10 meters |
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What is true north? And what is its symbol?
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Any line from the north pole. Line ending with a star.
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What is magnetic north? And what is its symbol?
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The magnetic field close to the north pole, compass arrow seeks it. Line ending with a half arrow.
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What is grid north, and what is its symbol?
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Vertical grid lines on a map, indicated by GN on a map.
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What is a hill?
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An area of high ground.
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What is a ridge?
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Series of hills connected to each other near the top.
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What is a saddle?
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Low point between two area's of higher ground.
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What is a finger?
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Short, continuous sloping line of higher ground.
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What is a draw?
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Continuous sloping line of low ground. There's often a small stream in the draw.
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What is a depression?
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Low point in the ground, below seal level.
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What are the 8 parts of a compass?
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1. Cover
2. Base 3. Floating dial 4. Glass encasement 5. Bezel ring 6. Rear Sight 7. Lens 8. Rear sight slot |
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Where do E and W fall on a compass?
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E-90 degrees
W: 270 degrees |
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What do the outer and inner scales denote on the compass (protractor as well)?
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Outer: Mils (black)
Inner: Degrees (red) |
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When are Mils normally used?
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Arty, tank and mortar gunnery.
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What does a Mil express?
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The size of an angle formed when a circle is divided into 6,400 angles with the vertex of the angles at the center of the circle.
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How do you convert between the two? Degrees/Mils
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A circle equals 6,400 divided by 360 degrees or: 17.78 mils.
To convert degrees to mils, multiply degrees by 17.78. |
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How many clicks rotate the Bezel ring fully?
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120
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To convert a magnetic azimuth to a grid azimuth what must you do?
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Add the G-M angle.
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How do you orient a map using a compass?
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Lie the compass's straight edge along the magnetic arrow of the declination diagram. Rotate the map and compass simultaneously until the north-seeking arrow is below the fixed back on the compass.
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Orienting a map using terrain association.
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Identify terrain around you, identify it on your map and orient.
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How do you locate yourself by inspection?
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Use prominent features around you and locate yourself using relation to these features.
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Locating yourself by one-point resection.
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-Identify a linear feature. Identify a prominent feature, sight in on the feature and read the mag. azimuth.
-Convert to a grid azimuth. -Convert it to a grid back-azimuth. -With a protractor, plot it back until it crosses the linear feature. |
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Locating yourself using two-point resection.
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-Locate and sight in on two different features and get two magnetic azimuth's to each.
-The two different points should be at least 30 degrees apart but not more than 150 degrees. -Convert to grid back-azimuth's. -Use a protractor to draw your two lines, you are where they intersect. |
