TC 3-25.26 Land Navigation and Map Reading Flashcards
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 degress
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 roach 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
