Basic Land Navigation (Map & Compass) (WEEK 5) Flashcards
A scale on the bottom of the map that is labeled 1:24,000 is known as the _______?
Representative Fraction
If you shot an azimuth of 120* degrees and you declination for that area is 16* degrees, what would your new azimuth be in relation to the map?
136* degrees
120* + 16* = 136*
A scale on the bottom of the map that shows distance is represented in a ________ is known as the _______ (RF)
Fraction, Representative Fraction
Contour intervals measure _________ between contour lines.
Elevation
_________ intervals are father apart at the top and closer together at the bottom.
A) Concave
B) Convex
Convex
For the Magnetic Declination correction you need to go from _______ to _______.
Magnetic North , True North
Add declination when moving from compass to map
If you shoot an azimuth of 185* what is your back azimuth?
5* degrees (185* - 180*= x ) **You subtract declination when moving from map to compass*
USGS maps are oriented with _________ at the top..
True North
A _________ is also known as a topographical map.
7.5 Minute quadrangle map
Imaginary lines called ________ and _________ meet at a point called Initial Points.
Baselines , Principle Meridians
To determine the percentage of a slope you divide the ________ by the _________ and then multiply by 100.
Vertical, Horizontal
What does this symbol represent on a map.
Un-improved Road
Know what a Quarry or Open mine symbol looks like.
It is two crossed picks
**How many initial points are in California and what are their names?***
3, Humbolt base and meridian, Mt. Diablo base and meridian, San Bernardino base and meridian
What is the slope formula?
Rise over Run X 100
How is slope expressed?
In Percent
How many steps are in a pace?
TWO
What is the normal pace length /Stride?
5 feet
List the parts of a compass?
Magnetic needle, Revolving 360^ dial, Base Plate Mirror, Orienting lines, Sites
How do you hold a compass?
Flat and level
What is the azimuth adjustment for a compass in California?
14 to 20 degrees in California
How do you get a back Azimuth?
Add 180 degrees
How many feet / chains are in one mile?
5,280 feet or 80 chains
How many feet in a yard?
THREE
How many feet are in an acre?
208 X 208 = 43,560
How many feet are in a chain?
66 feet
How many chains in an acre?
10 Square chains
One square mile / one section equal?
640 acres
How many acres in a section?
640 Acres in a section
What is an intersection?
A point on a map intersecting two known landmarks
What is resection?
Finding ones location by sighting two known landmarks
On a topo map how are ridges shown?
U shaped, maybe V shaped on a pointed ridge
On a topo map how are drainages shown?
V shaped V bottom points uphill.
How is a box canyon shown on a topo map?
Canyon with walls on three sides
How are saddles shown in a topo map?
A low area along a ridge between two high areas
What is contour interval?
The difference in elevation between the contour lines
What is an index contour?
Every fifth contour that is printed darker with elevation marked on it
What are range lines?
A series of lines six miles apart running north and south
What are township lines?
A series of lines running east to west six miles part
On a map where is North?
The top (unless specified
The normal size topo map used?
7.5 minute quadrangle
1in. = 24,000in is what?
A representative fraction
Map Color
BLACK
Man made
Map Color
BLUE
Water
Map Color
GREEN
Vegetation
Map Color
BROWN
Relief
Map Color
RED
Major Road
What are the two maps mostly used?
Planimetric, Topographic
A line drawing, to some scale, of the earth’s surface is?
The definition of a map
One Township is equal to how many square miles?
36 square miles
(True / False)
There are 640 acres in 1 square mile?
TRUE
(True / False)
Compass readings are magnetic Azimuth?
TRUE
(True / False)
Map readings are true Azimuth?
TRUE
What does USGS stand for?
United States Geological Survey
What does a legend show?
Key accompanying the map which shows information needed to interpret that map.
What are the 3 types of topo maps?
Contour maps, shaded maps, slop maps
What do fire lookouts use to determine the location of a fire?*
Intersecting
What is the Universal Transverse Mercator (UTM)?
A grid system that divides the earth into vertical and horizontal sections (lat and long)
Five most common colors found on a map an what do they mean?
- Black=cultural or human made features
- Blue=water features lakes rivers
- Green=Vegetation such as woods and orchards
- Brown=all relief features contours, lots and fills
- Red=main roads, built up areas and boundaries
Three types of planimetric maps are?
- Common road maps
- Specific area maps
- CDF administrative maps
What cardinal point is usually on top of a map and bottom right left?
North, South, East, West
1 Mile =how many feet?
5,280 feet
1 yard= how many feet?
3 feet
1 acre= how many feet?
43,560 square feet
1 chain= how many feet?
66 feet
Three basic parts of a compass?
- Magnetic needle
- 360 dial
- Transparent base plate.
**1 degree of latitude can be divided into…….****
60 minutes
**What is Intersection?
locating two points on a map by intersecting two known landmarks
**A representative fraction, what is a map scale?*
Scale expresses the ratio of the maps distance to the ground, distance in same measurements
1: 24,000 - 7.5
1: 62,500
1: 250,000
**What is a graphic scale on a map?
Compares distance to the ground distance in different units of measurements
ie; 1 = 1 mile on the map
*****Resection is used to….
determine one’s own landmark
*****How would you read?
3821.88N 12056.57
- Thirty eight degrees twenty one point eighty eight minutes North Latitude BY (X)
- One hundred twenty degrees fifty-six point fifty-seven West Longitude
***U Shape is…
Ridge
**V Shape is…..
Drainage or narrow valleys. The point of the “V” always points uphill or upstream
