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38 Cards in this Set

  • Front
  • Back
Where is the sheet name found on a map?
The center of the upper margin and either the right or left side of the lower margin
Where is the sheet number found on a map?
The upper right margin and the lower left margin
What is the elevation guide and where is it found on a map?
A miniature characterization of terrain shown, it is normally found in the lower right margin
What is the declination diagram and where is it located on a map?
It indicates the angular relationships of true north, grid north and magnetic north and is located on the lower margin
What illustrates and identifies the topographic symbols used to depict some of the more prominent features on the map (railroad tracks, buildings, swamps)?
What is the basic map reading rule?
The designation of a point is based on the principle "read right then up" (right on vertical grid lines, up on horizontal)
What digit grid coordinate locates a point within 1000 square meters?
Four digit grid coordinate
What digit grid coordinate locates a point within 100 square meters?
Six digit grid coordinate
What digit grid coordinate locates a point within 10 square meters?
Eight digit grid coordinate
What is a line from any point on the earth's surface to the North Pole?
True North
What can be found at night by locating the North Star?
True North
How is magnetic north found?
The earth has a magnetic field that is close to (but not exactly on) the North Pole
How is grid north established?
By using the vertical grid lines on the map. Symbolized on map by letters GN
What is an area of high ground and is shown on a map by contour lines forming concentric circles?
What is a series of hills that are connected to each other near the top?
What is a dip or low point between two areas of higher ground?
What is a short, continuous sloping line of higher ground, normally jutting out from the side of a ridge or hill?
On a map, contour lines on a map will depict a finger with the U or V point away from high ground for this type of terrain feature?
This is a low point in the ground or a sinkhole, represented on a map by closed contour lines that have tick marks pointing toward low ground?
In a lensatic compass, this protects the floating dial and the glass encasement?
In a compass, this contains the sighting wire and two luminous sighting dots for navigation?
Who normally uses the Mil (m) in a lensatic compass?
Artillery, tank and mortar gunnery
A circle equals how many mils?
6400 mils equals how many degrees on a compass?
360 degrees
How do you convert degrees to mils?
Multiply by 17.78
What houses the floating dial and contains a fixed black index line?
Glass encasement
What device clicks when turned and contains 120 clicks when rotated fully?
Bezel ring
When using the bezel ring, each click equals how many degrees?
3 degrees
What is attached to the base of the compass?
Thumb loop
What is used to lock the floating dial?
Rear sight
What must be opened more than 45 degrees to allow the floating dial to float freely?
Rear sight
What is used to read the floating dial?
What is used in conjunction with the front sighting wire when aiming at objects?
Rear Sight Slot
How do you orient a map with a compass?
With the map flat on the ground, place the straightedge (on the left side of the compass) along the magnetic north arrow on the declination diagram so that the cover of the compass is pointing toward the top of the map. This will put the fixed black index line of the compass parallel to the magnetic north arrow of the declination diagram
- Keeping the compass aligned as directed above, rotate the map and compass simultaneously until the north-seeking arrow is below the fixed black index line on the compass. Your map is now oriented.
How do you orient a map using Terrain Association?
- Identify prominent terrain features on the map that you can find on the ground.
- Align terrain features with the map. If there is a tower to your right front, then orient the map so that the tower is to your right front. If there is a road off to your left, then ensure the road on the map is parallel to the road on the ground. Once all of the features are lined up, your map is oriented
How do you determine your position using the "Location by inspection" method?
- You are standing in the vicinity of several prominent features which can easily be located on the map. By orienting the map and estimating your relation to these features, you should have no difficulty in determining your location.
How do you determine your position using the "Location by one-point resection" method?
- Identify the linear terrain feature that you are located on or near in respect to the ground on your map.
- Identify a prominent feature on the ground and locate that feature on your map.
- Using the compass-to-cheek technique, sight in on the feature and read the magnetic azimuth
- Convert the magnetic azimuth to a grid azimuth.
- Convert this grid azimuth to a grid back azimuth.
- With your protractor, plot this grid back azimuth from the feature on the map and extend it until it crosses the linear feature.
- Conduct a map inspection to verify your resection.
- When selecting a terrain feature, choose one that is perpendicular to the axis of the linear terrain feature so that when you plot the back azimuth on the map, the line will cross the linear feature more or less at a right angle.
How do you determine your position using the "Location by two-point resection" method?
-Select two prominent features on the ground whose positions can be located on the map. These features should be at least 30o but not greater that 150o apart.
- Using the compass-to-cheek technique, determine the magnetic azimuth to each object
- Convert these magnetic azimuths to grid back azimuths.
- With your protractor, draw the respective back azimuths from these two points on your map.
- Extend the azimuth lines from these two points until they intersect. You are located at the point where these two lines cross.
- Conduct a map inspection to verify your position