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FMF > S. 114 land nav > Flashcards

S. 114 land nav Flashcards

1
Q

what is a map named after

A

most prominent cultural or geographical feature. largest city on the map where possible

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2
Q

where is the sheet name located

A

center of upper margin and either right/left side of lower margin

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3
Q

what is a sheet # used for

A

reference # for that map sheet

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4
Q

the sheet # is found in what 2 places

A

upper right and lower left margin

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5
Q

what representative fraction does a scale offer

A

ratio of a distance on the map to the corresponding distance on the earths surface

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6
Q

where is the scale located

A

upper left margin after the series name and center of the lower margin

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7
Q

what is the purpose of the elevation guide

A

helps you rapidly ID major land forms

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8
Q

where is the elevation guide located

A

lower right margin

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9
Q

what does the declination diagram indicate

A

the angular relationship of true north, grid north, and magnetic north (located in lower margin)

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10
Q

bar scales are used to convert what

A

map distance to ground distance

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11
Q

where are bar scales located

A

center of the lower margin

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12
Q

the legend helps ID what

A

topographic symbols

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13
Q

where is the legend located

A

lower left margin

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14
Q

what are grid lines

A

straight lines intersected at right angles forming a series of squares

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15
Q

how do grid squares measure on the most common military map

A

1,000x1,000 meters

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16
Q

what is the basic map reading rule

A

read right the up

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17
Q

a four digit grid coordinate locates a point within how many square meters

A

1,000

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18
Q

a six digit grid coordinate locates a point within how many square meters

A

100

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19
Q

a 8 digit grid coordinate locates a point within how many square meters

A

10

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20
Q

what is true north

A

a line from any point on the earths surface to the north pole

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21
Q

how can true north be located at night

A

north star

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22
Q

when is true north utilized

A

when traveling without a compass

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23
Q

how is true north represented on the declination diagram

A

a line ending with a star

24
Q

how is magnetic north indicated

A

north seeking arrow of lensatic compass

25
Q

how is magnetic north symbolized on the declination diagram

A

a line ending with a half arrowhead

26
Q

how is grid north indicated on the declination diagram

A

GN

27
Q

what must be used to work with an azimuth measured from grid north

A

protractor

28
Q

define hill

A

an area of high ground

29
Q

how is a hill depicted on a map

A

contour lines forming concentric circles

30
Q

define ridge

A

series of hills that are connected to each other near the top

31
Q

define saddle

A

a dip or low point between two areas of higher ground

32
Q

how is a saddle depicted on a map

A

hourglass or figure-eight shaped contour lines

33
Q

define finger/spur

A

short, continuous sloping line of higher ground, normally jutting out from the side of a ridge or hill

34
Q

how is a finger depicted on a map

A

U or V pointing AWAY from high ground (ground slopes down in 3 directions)

35
Q

define DRAW

A

short, continuous sloping line of LOW ground normally cut in the side of a ridge or hill

36
Q

how is a draw depicted on a map

A

U or V pointing TOWARD high ground

37
Q

define depression

A

low point in the ground or a sink hole. surrounded by higher ground in all directions

38
Q

how is a depression indicated on a map

A

closed contour lines that have tick marks pointing toward low ground

39
Q

what does the cover contain on a lensatic compass

A

sighting wire and two luminous sighting dots for night navigation

40
Q

how is the floating dial mounted

A

on a pivot

41
Q

what does the floating dial consist of

A

magnetic needle, luminous arrow and the letters E (90º) and WEST (270º) printed on the dial

42
Q

what are 2 scales on the floating dial

A

outer denotes MILS (black) inner denoted (degrees) red

43
Q

MILS are normally used by what

A

arty, tank, mortar gunnery

44
Q

what does a MIL express

A

size of an angle formed when a circle is divided into 6,400 angles with the vertex at the center

45
Q

what formula is used to convert degrees to mills

A

multiply degrees by 17.78

6,400 ÷ 360 = 17.78

46
Q

what is the purpose of the glass encasemnent

A

houses the floating dials and contains a fixed black index line

47
Q

what is a bezel ring

A

device that clicks when turned. 120 clicks when rotated fully. 1 click 3º

48
Q

where is the thumb loop attached

A

the base

49
Q

what is the rear sight used for

A

lock the floating dial

50
Q

why must the rear sight be opened greater than 45º

A

allow the floating dial to float free

51
Q

what is the lens used for

A

read the floating dial

52
Q

what is the angular difference between grid north and magnetic north called

A

G-M angle

53
Q

how should G-M angle be rounded

A

nearest whole degree

54
Q

how does location by inspection work

A

estimating your relation to several prominent features

55
Q

why is it better to use two-point resection vs one-point

A

doesn’t rely on ability to accurately estimate

56
Q

how far apart should two prominent features be when using two point resection

A

at least 30º but no more than 150º

FMF (19 decks)

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