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TC 3-25.26 Land Navigation and Map
This deck covers essential questions and answers from the TC 3-25.26 Land Navigation and Map guide, focusing on key concepts such as terrain features, navigation methods, and map reading techniques.
How many mils are in one degree?
17.7 mils
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Key Terms
Term
Definition
How many mils are in one degree?
17.7 mils
How many mils are in a compass?
6400 mils
How many degrees are in a compass?
360 degrees
What does the acronym OCOCKA stand for?
Observation and Fields of Fire, Cover and Concealment, Obstacles, Key Terrain, and Avenues of Approach
What are the three land navigation methods?
Dead Reckoning, Terrain Association, and a combination of techniques.
What is Map orientation?
The first step to land navigation, when the north south on the map aligns with the north south on the ground
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| Term | Definition |
|---|---|
How many mils are in one degree? | 17.7 mils |
How many mils are in a compass? | 6400 mils |
How many degrees are in a compass? | 360 degrees |
What does the acronym OCOCKA stand for? | Observation and Fields of Fire, Cover and Concealment, Obstacles, Key Terrain, and Avenues of Approach |
What are the three land navigation methods? | Dead Reckoning, Terrain Association, and a combination of techniques. |
What is Map orientation? | The first step to land navigation, when the north south on the map aligns with the north south on the ground |
What are the two supplementary terrain features? | Cut
Fill |
What are the three minor terrain features? | Cliff
Draw
Spur |
What are the five major terrain features? | Hill
Saddle
Ridge
Valley
Depression |
What are the different types of contour lines? | Index, Intermediate, Supplementary |
What does GPS stand for? | Global Positioning System |
What are the two techniques for using the lensatic compass? | Center Hold
Cheek Hold |
What are the three major parts of the lensatic compass? | Cover
Base
Lens |
What are the ways to determine your location? | Resection
Modified Resection
Intersection |
What is modified resection? | 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 or canal or stream |
What is resection? | 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 a map |
What is intersection? | Location of an unknown point by successively occupying at least two known positions on the ground and then map sighting on the unknown location |
What is the grid magnetic angle? | The angular size that exists between grid north and magnetic north |
What is a back azimuth? | The opposite direction of an azimuth. |
What is 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 |
How close will a 10 digit grid get you? | Within 1 meter |
How close will a 8 digit grid get you? | Within 10 meters |
How close will a 6 digit grid get you? | Within 100 meters |
How many grid zones is the world divided into? | 60 |
What is the rule of thumb for reading maps? | Right and up |
What are the three types of norths? | Grid, Magnetic and True |
What does UTM stand for? | Universal Transverse Mercator Grid |
What are the colors of a military map? What do they represent? | Black- Man Made Features
Red- Brown- Relief Features
Blue- Water Features
Green- Vegetation
Brown- Relief Features (contour lines)
Red- populated areas, main roads |
What are the three map sizes? | Small, medium, large |
Who is responsible for securing maps for the unit? | s2 |
Definition of a map? | Graphic representation of a portion of the earth's surface drawn to scale, as seen from above |