Map Reading and Land Navigation Flashcards
How is a lensatic compass held?
Centerhold and compass-to-cheek
What is a Map?
A graphic representation of a portion of the Earth’s surface drawn to scale, as seen from above
Where is the legend on a map?
Lower left margin.
Which North is used when using a Military map?
Grid North
What is the basic rule for reading grid coordinates on a Military map?
Right and up
What is a back azimuth?
180 degrees in reverse of a measured azimuth
How close does an eight-digit, six-digit, and four-digit grid coordinate locate a point?
10 meters, 100 meters, and 1,000 meters
What is an azimuth?
Direction, defined as a horizontal angle measure from North in a degrees or mils.
What are Contour Lines?
Imaginary Lines on the ground that connect points of equal elevation.
Can a lensatic compass be used at night?
Yes, it has luminous dials and needles.
What are the three types of Contour Lines?
Index, Intermediate, and Supplementary
What two things can affect a lensatic compass?
Metal or electricity
What is longitude?
The imaginary rings around the earth running north and south, specifying positions east to west. Measured in degrees and minutes.
Name the two scales on a lensatic compass.
Mils and Degrees
How many scales are there on a Compass?
Two
Name the two Supplemental Terrain features.
Cut and Fill
Name the five types of Terrain found on a map.
Ridges, Hilltops, Valleys, Depressions, and Saddles.
What is a Base Line?
The starting point or point of reference from which a unit of measure is taken.
Name the minor Terrain features found on a map.
Draw, Spur, and Cliff
Name the three Norths on a Military maps.
True North, Magnetic North, and Grid North.
What is Latitude?
The imaginary rings around the earth running east and west and parallel to the equator, specifying positions north to south. Measured in degrees and minutes.
What are the five basic colors of a map and what do they stand for?
Blue: Water and water features
Red: Roads
Black: Man-made objects
Green: Vegetation
Brown: Contour lines, elevation, and relief
Define Resection.
A method used to locate one’s position on a map by determining the grid azimuth to at least two well-defined locations that can be pinpointed on the map.
Define Intersection.
A method used to determine the location of an unknown point by successively occupying at least two known positions on the ground and then map sighting on the unknown location.
