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SWE > Navigation > Flashcards

Navigation Flashcards

1
Q

What is a circle?

A

Visual Fix

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2
Q

What is a triangle?

A

Electronic Fix

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3
Q

What is a square?

A

Estimated Position

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4
Q

What is a half moon?

A

Dead Reckoning

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5
Q

What is a circle w/ dot in the middle?

A

Visual reference without previous fix data.

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6
Q

Sailing Chart scale?

A

1:600,000

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7
Q

General Chart scale?

A

1:150,000 - 1:600,000

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8
Q

Coastal chart scale?

A

1:50,000 - 1:150,000

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9
Q

Harbor chart scale?

A

1:50,000 - larger

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10
Q

Degrees of latitude are always ___ miles apart?

A

60NM

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11
Q

Distance between degrees of LONGITUDE are __NM at the equator.

A

60, but less further north or south.

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12
Q

Water level depth is measured at?

A

Mean Low tide

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13
Q

What is standard map projection style?

A

Mercator projection

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14
Q

Gnomonic Projection used for?

A

Navigation on the great circle

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15
Q

Stereographic projection used for?

A

Navigation in polar regions

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16
Q

NOAA charts sounding datum?

A

Indicated as Mean Lower Low Water (MLLW)

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17
Q

Letter for center of mo board?

A

“e”

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18
Q

Mo board letter for “own ship” course and speed?

A

“er”

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19
Q

Contacts direction and speed on mo board?

A

DRM and SRM

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20
Q

Vector representing contacts true course and speed on mo board?

A

“em” = them

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21
Q

What is least accurate type of fix?

A

Radar fix

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22
Q

One degree equals?

A

60 NM

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23
Q

What is course?

A

Intended direction of travel

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24
Q

What is heading?

A

ACTUAL direction vessel is traveling.

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25
Q

What is dead reckoning?

A

Approximate position by advancing a previous position accounting for course and speed.

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26
Q

What defines a nautical mile?

A

Equal to 1 minute of latitude.

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27
Q

How many degrees of latitude?

A

0 degrees - 90 degrees North/South

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28
Q

How many degrees of longitude?

A

0 degrees - 180 degrees (East/ West)

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29
Q

60 minutes equals?

A

1 degree

30
Q

Outermost circle on compass rose?

A

Oriented true north.

31
Q

Innermost circle on compass rose?

A

Magnetic North.

32
Q

Longitude is measured East/West of?

A

Prime Meridian (0-180 degrees)

33
Q

Latitude is measured North or South of?

A

The equator (0-90 North/ South)

34
Q

1 minute of latitude is?

A

1 NM

35
Q

Title block section of a chart?

              “SAPSSD”
A

Seal
Area covered by chart
Projection
Scale
Sounding information
Datum information

36
Q

Interval between radar pulses?

A

Pulse repetition frequency

37
Q

How does radar differentiate between two vessels on same bearing but different ranges?

A

Range resolution

38
Q

What type of radar return is caused by ocean waves?

A

Sea return

39
Q

All definitions showing chart symbols and abbreviations are contained in?

A

Chart No. 1

40
Q

1NM is equal to how many feet/yards?

A

6080FT/2000YDS

41
Q

Formula to calculate time?

A

D÷S=T

42
Q

Formula to calculate speed?

A

D÷T=S

43
Q

Formula to calculate distance?

A

SxT=D

44
Q

X-Band Radar wavelength/Freq range?

A

3CM, 9300-9500Mhz

45
Q

S-Band Radar wavelength/Freq range?

A

10CM, 2900-3100Mhz

46
Q

The majority of marine radars operate within a range of?

A

400-4000 pulses per second

47
Q

RACONS respond to what type of radars?

A

3 and 10 CM radars

48
Q

Max range for RACON reception?

A

Limited by Line of Sight

49
Q

What IALA regime does U.S. use?

A

IALA B

50
Q

Topmost band of a cylindrical buoy is ALWAYS?

A

Green, when used as a lateral mark.

51
Q

What is the topmost band of a conical buoy when used as a lateral mark?

A

Red

52
Q

When returning from sea, a triangular shaped dayboard marks the?

A

Starboard side of the channel.

53
Q

When returning from sea, a square shaped dayboard marks?

A

Port side of the channel.

54
Q

Only ATON with green or red lights have?

A

Lateral significance.

55
Q

Green lights mark?

A

Port side of channels.

56
Q

Red lights mark?

A

Starboard side of channels.

57
Q

International chart scale?

A

1:350,000-1:10,000,000

58
Q

What are the 5 classifications of conventional nautical charts?

A

International, Sailing, General, Coastal, Harbor.

59
Q

Difference between true and magnetic North is called?

A

Variation.

60
Q

Soundings are measured as?

A

Feet, Fathoms, or Meters.

61
Q

Edition number of a chart located?

A

Lower left hand corner of chart.

62
Q

Slanted lettering on a chart is used to label?

A

Information affected by tidal changes/currents.

63
Q

Vertical lettering on a chart is used to describe?

A

Information NOT affected by tidal changes/current.

64
Q

What are the two types of electronic chart data?

A

Vector and Raster Charts.

65
Q

How many satellites make up the GPS system?

A

24 satellites.

66
Q

When there are only 2 LOP’s or ranges for a fix?

A

Quality of fix will be best when there is a 90 degree difference in the lines.

67
Q

An ideal fix has 3 or more LOP’s intersecting at a single point. The LOP’s have a separation of?

A

At LEAST 60, but not more than 120 degrees.

68
Q

Converting minutes into tenths of hours is done by?

A

Dividing minutes by 60.

69
Q

Converting tenths of hours into minutes is done by?

A

Multiplying by 60.

70
Q

CG Navigation Standards Manual requires that each fix be followed by a DR track of at least?

A

2 fix intervals.

SWE (7 decks)

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