Land Navigation (FM 3-25.26) Flashcards
How many mils are in one degree?
17.7
How many mils are on a lensatic compass?
6400
What are the 4 slopes on a map?
- gentle
- steep
- concave
- convex
What are the colors on a map?
- Black is for man made features such as buildings or roads
- Blue is for hydrology such as lakes, swamps, rivers
- Green is for vegetation with military significance such as woods and orchards
- Red is for cultural features such as populated areas, main roads
- Brown is for relief features and elevation
- Red-Brown are combined to identify features such as contour lines on red-light readable maps
What is the declination diagram?
It shows the angular relationship between the magnetic north, grid north, and true north.
Into how many grids is the World divided?
60 grid zones
What are the 3 units of measure for direction?
- degree
- mil
- grad
What is an azimuth?
a horizontal angle measured clockwise from a north base line
How do you get a back-azimuth?
To obtain a back azimuth add 180 degrees if the azimuth is 180 degrees or less, or subtract 180 degrees if the azimuth is 180 degrees or more
What are the 3 ways to determine your location on a map?
- intersection
- resection
- modified resection
What are the 3 types of contour lines?
- intermediate
- index
- supplementary
What does OCOKA stand for?
- Observation and Fields of Fire
- Cover and Concealment
- Obstacles
- Key Terrain
- Avenues of Approach
What is a map?
A map is a graphic representation of a portion of the earth’s surface drawn to scale, as seen
from above.
The lensatic compass has a bezel ring; each bezel ring click is equal to how many degrees?
3 degrees
How many times would the bezel ring click if it were fully rotated?
120 clicks
