Land Navigation / Map Reading Flashcards
What is the Field Manual for map reading and land navigation?
FM 3-25.26
What are the basic colors of a map, and what does each color represent?
Black - Indicates cultural (man-made) features such as buildings and roads, surveyed spot elevations, and all labels.
Red-Brown - The colors red and brown are combined to identify cultural features, all relief features, non-surveyed spot elevations, and elevation, such as contour lines on red-light readable maps.
Blue - Identifies hydrography or water features such as lakes, swamps, rivers, and drainage.
Green - Identifies vegetation with military significance, such as woods, orchards, and vineyards.
Brown - Identifies all relief features and elevation, such as contours on older edition maps, and cultivated land on red-light readable maps.
Red - Classifies cultural features, such as populated areas, main roads, and boundaries, on older maps.
Other - Occasionally other colors may be used to show special information. These are indicated in the marginal information as a rule.
Where is the Legend of the map found?
Lower left margin
What are contour lines?
Imaginary lines on the ground connecting equal elevation, they represent high and low ground elevation.
What are 3 types of contour lines?
Index
Intermediate
Supplementary
How many Mils are in one Degree?
17.7 mils
How many Norths are there on a military map?
True north
Magnetic north
Grid north
What must be done to a map before it can be used?
It must be oriented.
What are 5 major terrain features found on a map?
Hill Ridge Valley Saddle Depression
What are the 3 minor terrain features found on a military map?
Draw
Spur
Cliff
What are the 2 supplementary terrain features found on a military map?
Cut
Fill
What is an azimuth?
A horizontal angle, measured in a clockwise manner from a north base line, expressing direction.
What is the distance between grid lines on a combat map?
1 kilometer or 1000 meters
How many mils are there in a circle?
6400 mils in 360 degrees
Which north is used when using a military map?
Magnetic north when using a compass, and grid north when using the map
How would you hold a lensatic compass?
Away from metal (weapons, electrical devices), level and firm
Name two ways to hold a compass?
Compass-to-Cheek Method
Center-Hold Method
Are topographic symbols drawn to scale?
No
What do topographic symbols represent?
Man-made and natural features
What is Back Azimuth?
The opposite direction of an azimuth.
What is the general rule for reading military grid coordinates?
Right and UP
How many sights does a compass have?
2
The lensatic compass has a bezel ring; each bezel ring click is equal to how many degrees?
3
Large cities on a map are represented by what color?
Black
Name two ways to orient a map?
Use a compass and terrain association
The arrow on a compass always points what direction?
Magnetic north
How many scales are there on a compass, what are they?
Degrees
Mils
What are the three elements for a land navigation process known as Dead Reckoning?
Known starting point
Known distance
Known azimuth
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
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 two methods of measuring an azimuth?
Compass and a protractor
How close will an eight-digit grid get you to your point?
10 meters
How close will a six-digit grid coordinate get you to your point?
100 meters
What would you use on a map to measure actual ground distance?
The bar scale
