Map Reading & Land Navigation Flashcards
What’s the purpose of a map?
Provide accurate information for: Location Distance between features Populated areas Routes of travel Communication
FM covers map reading and land navigation?
FM 3-25.26
Name the different types of maps
Topographic
Planimetric
Photo
Terrain model
Where is the map sheet name found?
Center of upper margin &
Right or left side of lower margin
Where is the scale of a map found?
Upper left margin & lower margin at center
What is a declination diagram?
It shows the angular relationships of true north, grid north and magnetic north
What are the 3 units of measure in a bar scale?
Meters
Statute miles
Nautical miles
Where is the legend located?
Lower left margin
Name & describe the 5 colors used in a map
- Black- man made features
- Blue- water
- Green- vegetation w/ military significance
- Brown- relief features/elevation/contour lines
- Red- cultural features/populated areas/main roads/boundaries
Where is the prime meridian?
Greenwich, England
What type of map does the US Military use?
UTM
Universal Transverse Mercator
What part of the world is the UTM designed for?
Between Lat. 84 degrees North &
Lat. 80 degrees South
Basic rule for reading a map
Start at bottom left
Read right, then up
How close will you get with an 8 digit coordinate?
Within 10 meters
3 types of contour lines?
Index
Intermediate
Supplementary
How is water flow determined on a map?
Contour lines form a V pointing upstream
What is an azimuth?
A direction
Horizontal angle measured in degrees or mills from the North
How do you find a back azimuth?
180 or less = + 180
180 or more = - 180
5 major terrain features
Hill Ridge Valley Saddle Depression
5 minor terrain features
Draw Spur Cliff Cut Fill
How many mills are on a compass?
6400
Name 3 parts of a compass
Base Cover Lens Bezel ring Floating dial Thumb loop Rear sight Magnetic arrow
Define magnetic declination
Variation of of true north from magnetic north
3 elements necessary for dead reckoning?
Known starting point
Known distance
Known azimuth