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Back to AI Flashcard MakerGeology /NCO Board Map Reading and Land Navigation, TC 3-25.26 & FM 3-25.26 Part 4

NCO Board Map Reading and Land Navigation, TC 3-25.26 & FM 3-25.26 Part 4

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This deck covers key concepts from TC 3-25.26 & FM 3-25.26 Part 4, focusing on map reading and land navigation, including units of measurement, types of north, azimuths, and methods for determining location.

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Para 6-1 | What are the units of measurement are used for Direction?

1. Degree. The most common unit of measure is the degree 2. Mil. Another unit of measure, the mil (abbreviated ), is used mainly in artillery, tank, and mortar gunnery 3. Grad. The grad is a metric unit of measure found on some foreign maps
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Key Terms

Term
Definition
Para 6-1 | What are the units of measurement are used for Direction?
1. Degree. The most common unit of measure is the degree 2. Mil. Another unit of measure, the mil (abbreviated ), is used mainly in artillery, tank, a...
Para 6-2 | How many Base Lines on a Military Map?
There are three base lines— true north, magnetic north, and grid north
Para 6-2 | How many Norths are on a Military Map?
Three; true north, magnetic north, and grid north
Para 6-2 | What are the most common Norths used on a Military Map?
The most commonly used are magnetic and grid
Para 6-2 | What is True North?
A line from any point on the earth's surface to the north pole. All lines of longitude are true north lines. True north is usually represented by a st...
Para 6-2 | What is Magnetic North?
The direction to the north magnetic pole, as indicated by the north-seeking needle of a magnetic instrument. The magnetic north is usually symbolized ...
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NCO Board Map Reading and Land Navigation, TC 3-25.26 & FM 3-25.26 Part 4
TermDefinition
Para 6-1 | What are the units of measurement are used for Direction?
1. Degree. The most common unit of measure is the degree 2. Mil. Another unit of measure, the mil (abbreviated ), is used mainly in artillery, tank, and mortar gunnery 3. Grad. The grad is a metric unit of measure found on some foreign maps
Para 6-2 | How many Base Lines on a Military Map?
There are three base lines— true north, magnetic north, and grid north
Para 6-2 | How many Norths are on a Military Map?
Three; true north, magnetic north, and grid north
Para 6-2 | What are the most common Norths used on a Military Map?
The most commonly used are magnetic and grid
Para 6-2 | What is True North?
A line from any point on the earth's surface to the north pole. All lines of longitude are true north lines. True north is usually represented by a star
Para 6-2 | What is Magnetic North?
The direction to the north magnetic pole, as indicated by the north-seeking needle of a magnetic instrument. The magnetic north is usually symbolized by a line ending with half of an arrowhead
Para 6-2 | What is Grid North?
The north that is established by using the vertical grid lines on the map. Grid north may be symbolized by the letters GN or the letter 'y'
Para 6-2 | What is an Azimuth?
An azimuth is defined as a horizontal angle measured clockwise from a north base line; the azimuth is the most common military method to express direction
Para 6-2 | What is an Back Azimuth?
A back azimuth is the opposite direction of an azimuth. It is comparable to doing 'about face.'
Para 6-2 | How do you Obtain a Back Azimuth?
To obtain a back azimuth from an azimuth, add 180 degrees if the azimuth is 180 degrees or less, or subtract 180 degrees if the azimuth is 180 degrees or more
Para 6-2 | What is a Magnetic Azimuth?
The magnetic azimuth is determined by using magnetic instruments, such as lensatic and M2 compasses
Para 6-4 | What is a Grid Azimuth?
A protractor is used to measure the angle between grid north and the drawn line, and this measured azimuth is the grid azimuth
Para 6-5 | How many different Protractors are there?
Four
Para 6-5 | What are the different Protractors?
1. Full Circle 2. Half Circle 3. Square 4. Rectangle
Para 6-6 | What does the Declination Diagram display?
shows the angular relationship, represented by prongs, among grid, magnetic, and true norths
Para 6-6 | What is the Grid-Magnetic Angle?
The G-M angle value is the angular size that exists between grid north and magnetic north
Para 6-6 | What is the Grid Convergence?
An arc indicated by a dashed line connects the prongs for true north and grid north. The value of the angle for the center of the sheet is given to the nearest full minute with its equivalent to the nearest mil
Para 6-6 | What is the Conversion?
There is an angular difference between the grid north and the magnetic north. Since the location of magnetic north does not correspond exactly with the grid-north lines on the maps, a conversion from magnetic to grid or vice versa is needed
Para 6-7 | What is the Intersection?
Intersection is the location of an unknown point by successively occupying at least two (preferably three) known positions on the ground and then map sighting on the unknown location
Para 6-7 | What is the two methods for Intersection?
two methods of intersection: the map and compass method and the straightedge method
Para 6-7 | When is the Straightedge methods for Intersection used?
The straight edge method is used when a compass is not available
Para 6-8 | What is Resection?
Resection is the method of locating one's position on a map by determining the grid azimuth to at least two well defined locations that can be pinpointed on the map
Para 6-8 | When using Resection what method can give you greater Accuracy?
For greater accuracy, the desired method of resection would be to use three or more well-defined locations
Para 6-8 | What is Modified resection?
Modified resection is the method of locating one's position on the map when the person is located on a linear feature on the ground, such as a road, canal, or stream
Para 6-8 | What are the ways to determine your Location on a Map?
1. Intersection 2. Resection 3. Modified resection