*Map Reading & Land Navigation (FM 3-25.26)
Card Set Information
*Map Reading & Land Navigation (FM 3-25.26)
Map Reading Land Navigation FM 25 26
Map Reading & Land Navigation (FM 3-25.26)
What is the FM for map reading and land nav?
What are the basic colors of a map?
Black - cultural features ( roads & buildings)
Red- populated areas, boundaries
Brown - elevation , relief areas
green - vegetation
red brown -cultural and relief features
What are military symbols?
symbols used to represent military organizations, instillations, and activities
Where is the legend found on the map?
lower left margin?
What are contour lines?
lines that represent elevation
what are the 3 types of contour lines?
how many mils are in one degree?
how many norths are on a map?
three - true north, magnetic north, grid north
What shape are contour lines that indicate a hill?
the contour lines form circles
what shape are the contour lines that indicate a saddle?
an hour glass
what shape contour lines represent a valley?
u shaped of v shaped
what shape are the contour lines that indicate a ridge?
u shaped or v shaped with the closed ends pointing away from ground
what shape contour lines indicated a draw?
v or u shaped pointing toward high ground
what shape contour lines indicate a spur?
u or v shaped pointing away from high grounds
what shapes are the contour lines that indicate a cliff?
very close lines sometimes touching each other
what shape are the contour lines indicate a cut?
tic marks that extend from the cut line
what shape are the contour lines indicate a fill?
tic marks that point toward lower ground
what must be done to a map before it can be used?
it must be oriented
what are the 5 major terrain features found on a map?
what are the 3 minor terrain features?
what are the two supplementary terrain features?
what is a map?
a geographical representation of the earths surface
what is an azimuth?
a horizontal angle that expresses direction
what is contour line interval?
the distance between adjacent contour lines on a map
what is the distance between grid lines on a map?
how many mils are in a circle?
which north is used when using a map?
magnetic north when using a compass and grid north when using a map
how would you hold a lensatic compass?
level and firm away from metal (weapons, electrical devices)
what are the two was to hold a compass?
compass to cheek method
center hold method
are topographic symbols draw to scale?
what do topographic symbols represent?
man made and natural features
what colors are used for a map overlay and what do they represent?
blue - friendly forces
red - enemy forces
black - boundaries
yellow - contaminated areas
green - engineer obstacles
what is back azimuth?
the opposite direction of an azimuth
how do you figure out a back azimuth?
add 180 degrees if the azimuth 180 degrees or less and subtract 180 degrees if the azimuth is 180 degrees or more
what is a declination diagram?
it shows the angular relationship between magnetic north, grid north and true north
what is the general rule for reading grid coordinates?
right and up
how many sights does a compass have?
what is a benchmark?
a man made marker showing points of elevation
what are parallels of latitude?
measured distances going north or south of the equator
a bezel ring click is equal to how many degrees?
how many times would a bezel ring click if it were fully rotated?
large cities on a map are represented by what color?
name two ways to orient a map
use a compass
what does FLOT mean?
forward line of operating troops
what does the term intersection mean?
finding an unknown point by sighting two or more known points
why is a map so important?
because a map can give you accurate distances locations and heights
what is resection?
method of locating ones position on a map by determining the grid azimuth of at least two known points
what are the two scales on a compass?
degrees and mils
what are the four quadrants on a map?
what are the three elements of dead reckoning?
known starting point
what is the feature that makes the lensatic compass work well at night?
the dials and needle are luminous
what is a polar coordinate?
plotting an unknown point using an azimuth and distance from a known starting point
On a lensatic compass there are two rings, an outer black ring and an inner red ring, what are they used for?
The inner red ring is used to find degrees, and the outer black ring is used to find mils
Name 3 field expedient methods of determining direction
The shadow-tip method, the watch method, and the North Star method
What is a contour level?
the vertical distance between contour lines
the boarder line around the edge of the map is called what?
Name the different slopes found on a map.
You must find at least how many known locations on a map and the actual ground in order to plot your location accurately?
at least 2
What are the three main map sizes?
What are two methods of measuring an azimuth?
Compass and a protractor
How close will an eight-digit grid get you to your point?
How close will a six-digit grid coordinate get you to your point?
What would you use on a map to measure actual ground distance?
The bar scale