Section 114 Land Navigation Flashcards
Where is the sheet name located?
Center of upper margin and either right,left side of lower margin
What is the sheet number used for?
Reference number for the map sheet
The sheet number is found in what two places?
Upper right and lower left margins
What representative fraction does a scale offer?
Ratio of a distance on the map to the corresponding distance on earths surface
Where is the scale located?
Upper left margin after the series name and center of the lower margin.
What is the purpose of the elevation guide?
Helps you rapidly identify major land forms
Where is the elevation guide located?
Lower right margin
What does the declination diagram indicate?
The angular relationships of true north, grid north, and magnetic north
Bar scales are used to convert what?
Map distance to ground distance
Where Are bar scales located?
Center of lower margin
The legend helps identify what?
Topographic symbols
Where is the legend located?
Lower left margin
What are grid lines?
Straight lines intersected at right angles forming a series of squares
How do grid squares measure on the most common military map?
1000x1000 meters
What is the basic map reading rule?
Read right then up
A four digit grid coordinate locates a point within how many square meters?
1000m
A six digit grid locates a point within how many meters?
100m
A eight digit grid will locate a point within how many meters?
10m
What is true north?
A line from any point on earth to the North Pole
When is true north utilized?
When traveling without a compass
How is true north located on the declination diagram?
A line ending with a star
How is magnetic north indicated?
North seeking arrow on a le static compass
How is magnetic north symbolized on the declination diagram?
A line with half an arrow head
How is grid north indicated on the declination diagram?
GN
What must be used to work with an azimuth measured from grid north?
A protractor
Define a Hill?
An area of high ground
How is a hill depicted?
Contour lines forming concentric circles
Define a Ridge?
Series of hills that are connected near the top
Define a Saddle?
A dip or low point between two areas of higher ground
How is a saddle depicted?
A hourglass or figure 8 shaped contour lines
Define a Finger or Spur?
Short, continuous, sloping line of higher ground, normally jutting out from the side of a ridge or hill
How is a finger depicted on a map?
U or V pointing away from high ground
Define a Draw?
Short, continuos sloping line of LOW ground normally cut into a ridge or hill
How is a draw depicted?
U or V toward high ground
Define a Depression?
Low point in the ground or a sink hole. Surrounded by higher ground in all directions
How is depression indicated?
Closed contour lines that have tick marks pointing toward low ground
What does the cover contain on a lensatic compass?
Siting wire
2 luminous sighting dots for night navigation
How is a floating dial mounted?
On a pivot
What does a floating dial consist of?
Magnetic needle
Luminous arrow
Letters E 90 degrees
Letters W 270 degrees
What are two scales on a floating dial?
Outer denotes MILS (black)
Inner denotes DEGREES (red)
MILS are normally used by what?
Arty
Tanks
Mortar gunnery
What formula is used to convert degrees into MILS?
Multiply degrees by 17.78
What is the purpose of glass encasement?
Houses the floating dial and contains a fixed black index line
What is a bezel ring?
Device that clicks when turned, 120 clicks when rotated fully, each click is 3 degrees
Where is the thumb loop attached?
He base
What is he rear site used for?
Lock the floating dial
Why must the rear site be opened more than 45 degrees?
Allow the floating dial to float freely
What is the lens for?
Read the floating dial
What is the angular difference between grid north and magnetic north called?
G-M angle
How should the GM angle be rounded?
Nearest whole degree
How does location by inspection work?
Estimating your relation to several prominent features
Why is it better to use two point resection than 1 point?
Doesn’t rely on ability to accurately estimate
How far apart should two prominent features be when using the two point resection?
At least 30 degrees but no more than 150
What is a map named after?
Most prominent cultural or geographic feature
