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Sea School OUOV Study guide > Navigation Study Guide > Flashcards

Navigation Study Guide Flashcards

1
Q

The term”Slack Water” during a tidal change means:

A. range of the tide
B. Plane of the tide
C. Little or no movement of water
D. Reversing the tide

A

A. Little or no movement of water

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2
Q

When entering a channel from the sea and decide to check your compass heading, you steer on a pair of range lights and find the upper light is in line with the lower light, you should:

A. Come left
B. Come right
C. Maintain your current course
D. Waiting until the lights are no longer in a. vertical line.

A

C. Maintain your current course

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3
Q

You observe a buoy mark having green and red horizontal bands, then will have a light characteristic of:

A. Interrupted quick flashing
B. Morse (A)
C. Quick Flashing
D. Composite group flashing (2+1)

A

D. Composite group flashing (2+1)

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4
Q

The direction of the earth’s surface wind it:

A. Directed from high pressure toward high pressure
B. Directed by the sun’s solar energy
C. Directed from low pressure towards high pressure
D. Deflected by the earth’s rotation (Coriolis Effect)

A

D. Deflected by the earth’s rotation (Coriolis Effect)

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5
Q

Your vessel’s position should be plotted using bearings of”

A. Buoys close at hand
B. Buys at a distance
C. Fixed known objects on shore
D. Non of the above

A

C. Fixed known objects on shore

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6
Q

Which buoy may be lettered but not numbered?

A. Preferred channel buoy
B. Green unlighted can buoy
C. Red lighted buoy
D. Green can buoy

A

A, Preferred channel buoy

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7
Q

Spring tides will produce:

A. Unpredictable currents
B. Unpredictable tide changes in the spring of the year
C. Higher highs and lower lows than normal
D. Lower highs and lower lows than normal

A

C. Higher highs and lower lows than normal

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8
Q

You must assume when using a buoy as an aid to navigation:

A. The buoy should be considered to always be in the charted position
B. The buoy may not be in the charted position
C. If lighted, the buoy should be considered to be in the charted position
D. The buoy should be considered to be in the charted position if it has been freshly painted.

A

B. The buoy may not be in the charted position

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9
Q

The “Local Notice to Mariners” provides corrections of a local nature to charts and is published:

A. Quarterly
B. Monthly
C. Weekly
D. Daily

A

C. Weekly

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10
Q

The term “Tide” means:

A. Salinity content of the water
B. Mixing of salt and fresh water
C. Horizontal movement of the water
D. Vertical movement of the water

A

D. Vertical movement of the water

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11
Q

When plotting a voyage, you should:

A. Rely on a buoy to be on station as charted
B. Never rely on a floating buoy to maintain its exact position
C. Rely on a buoy to show proper light characteristics
D. Assume a wreck buoy is directly over the wreck

A

B. Never rely on a floating buoy to maintain its exact position

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12
Q 
The difference in height between low and high tide is referred to as the:
A. Period of the tide
B. Springtide
C. Range of tide
D. None of the above
A

C. Range of tide

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13
Q

From seaward the IALA Region B red and green horizontally-banded buoys refer to:

A. Preferred channels
B. Channels for vessels constrained by draft
C. General anchorage areas
D. None of the above

A

A. Preferred channels

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14
Q

Determining the heights of land creatures on most charts unless otherwise stated, the “reference datums” is:

A. Mean low water
B. Mean high higher water

D. Mean sea water

A

C. Mean high water

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15
Q

Red or green lights may appear on:

A. Vertically striped red and white buoys
B. Horizontally banded buoys
C. Yellow buoys
D. Orange buoys

A

B. Horizontally banded buoys

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16
Q

The depth of the water on a chart is the:

A. Vertical distance from the chart sounding datum to the ocean bottom
B. Vertical distance from the chart sounding datum to the bottom, plus the heights of the tide
C. Average height of water of a specified period of time
D. None of the above

A

A. Vertical distance from the chart sounding datum to the ocean bottom

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17
Q

A North Hemisphere wind which shifts in a counter clockwise motion is called a:

A. Pressure wind
B. Coriolis wind
C. Veering wind

A

D. Backing wind

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18
Q

A vessels’s position acquired by using at least three or more bearings is called a:

A. Dead-reckoning position
B. Fix
C. Estimated position
D. Running fix

A

B. Fix

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19
Q

Mean lower low water (MLLW) is the reference plane used for:
A. Sounding on the U. S. east and west coasts
B. All vertical gulf measurements
C. Heights above water for lights, mountains, etc.
D. Soundings on the U.S. east coast only

A

A. Sounding on the U. S. east and west coasts

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20
Q

A single line of position combined with a dead-reckoning positions results in a(n):

A. Running fix
B. Estimated position
C. Assumed position
D. Fix

A

B. Estimated position

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21
Q

The sun and moon align twice each month-what type of tides can be expected?

A. Apogean
B. Perigean
C. Spring
D. Neap

A

C. Spring

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22
Q

A buoy mark with a composite group-flashing light indicates a:

A. Dredging operation
B. Fishing area only
C. Restricted area
D. Preferred channel

A

D. Preferred channel

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23
Q

On the U.S. east and west coasts charted depths are taken from:

A. Means sea level
B. Mean high level
C. Mean low water
D. Mean lower low water

A

D. Mean lower low water

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24
Q

A weather forecast expects a “backing” wind. In the Northern Hemisphere, this would indicate that it will:

A. Shift in a clockwise manner
B. Shift in a counter clockwise manner
C. Increase in velocity
D. Decrease in velocity

A

B. Shift in a counter clockwise manner

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25
Q

What type of tides occur when the sun and the moon are at right angles (90 degrees) to each other?

A. Neap
B. Spring
C. Diurnal
D. Semi-diurnal

A

A. Neap

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26
Q

If lighted preferred-channel buoy will show a:
A. Orange light whose characteristic is Morse (A)
B. Composite group-flashing (Morse (A)) white light
C. Composite groups-flashing (2+1) red or green light
D. Composite group-flashing (2+1) orange light

A

C. Composite groups-flashing (2+1) red or green light

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27
Q

A water forecast expects a “veering” wind. In the Northern Hemisphere, this would indicate that it will:

A. Shift in a clockwise manner
B. Shift in a counter clockwise manner
C. Continue blowing from the same direction
D. Increase in velocity

A

A. Shift in a clockwise manner

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28
Q

The length of a lunar day is:

A. The same length as a solar day
B. About 10 minutes longer than a solar day
C. About 50 minutes shorter than a solar day
D. About 50 minutes longer than a solar day

A

D. About 50 minutes longer than a solar day

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29
Q

A preferred-channel buoy may show a:

A. Fixed red light
B. Composite group-flashing light
C. Morse (A) white lights
D. Group-occulting light

A

B. Composite group-flashing light

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30
Q

To determine the depth of the water –what should you apply to your depth finder reading?

A. Subtract the draft of the vessel.
B. Add the draft of the vessel.
C. Subtract the sea water correction.
D. Add the sea water correction.

A

B. Add the draft of the vessel.

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31
Q

A local wind which occurs especially during the day owing to the land hearing up is a:

A. Foreign
B. Sea breeze
C. Land breeze
D. Chinook

A

B. Sea breeze

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32
Q

A location that is acquired by using three or more intersection lines of position taken at nearly the same time is a:

A. Dead-reckoning position
B. Fix
C. Running Fix
D. None of the Above

A

B. Fix

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33
Q

Flashing green lights may apple on:

A. Horizontally banded buoys
B. Vertically striped buoys
C. Yellow buoys
D. Spherical buoys

A

A. Horizontally banded buoys

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34
Q

Wind resulting from the cooling of a land mass more quickly especially at night than adjacent water is a:

A. Coastal breeze
B. Land breeze
C. Sea breeze
D. Mistral

A

B. Land breeze

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35
Q

The term “Mean High Water” is the average height of:

A. All high waters over a 19-year period
B. The higher high waters
C. The lower high waters
D. The lower of the two daily tides

A

A. All high waters over a 19-year period

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36
Q

Which term best describes “an accurate position which is NOT based on any prior position”?

A. Dead-reckoning position
B. Estimated position
C. Running fix
D. Fix

A

D. Fix

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37
Q

A safe water mark may exhibit”

A. vertical strips
B. A red light
C. A white light
D. A and C

A

D. A and C

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38
Q

Mean Low Water is an average height of:

A. All low water over a 19-year period
B. The surface of the sea
C. High waters and low waters
D. The lower of the two daily low tides

A

A. All low water over a 19-year period

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39
Q

A position obtained using only the vessels course and speed form a known position is a”

A. Dead-reckoning position
B. Estimated position
C. Running fix
D. Fix

A

A. Dead-reckoning position

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40
Q

A vertically-striped aid to navigation buoy may be:

A. Striped black and red
B. Striped black and yellow
C. Lighted with a white light
D. Lighted with a red light

A

C. Lighted with a white light

41
Q

The path a vessel is expected to follow is called the:

A. DR plot
B. Heading
C. Track line
D. Estimated course

A

C. Track line

42
Q

When plotting a DR, you should always start from a(n):

A. Known position
B. Assumed position
C. Safe water mark only
D. None of the above

A

A. Known position

43
Q

What best describes a safe water mark-painted and lighted?
A. Black and white stripes with an interrupted quick flashing light
B. Red and white stripes with a Morse (A) light
C. Black and red stripes with a Morse (a) light
D. Black and red stripes with an interrupted quick flashing light

A

B. Red and white stripes with a Morse (A) light

44
Q

A lighted buoy with a red spherical top mark indicates:

A. A safe water buoy
B. A fish trap area
C. A hazard to navigation
D. A bifurcation in the channel

A

A. A safe water buoy

45
Q

How many high tides occur each day on the East Coast of the United States

A. Five
B. One
C. Two
D. Three

A

C. Two

46
Q

Which IALA Region B aid to navigation mark may only be lettered and NOT numbered?

A. An unlighted, green, can buoy
B. A spherical red, nun buoy
C. A spherical buoy
D. A port side day-shape

A

C. A spherical buoy

47
Q

The scale on a nautical chart is given as 1:80,000. This means the representative faction is”

A. One inch on the chart equals 80,000 inches on the Earth’s Surface
B. One inch on the chart equals 80,000 feet on the Earth’s Surface
C. 1 degree of latitude on the chart equals 80,000 inches on the Earth’s Surface
D. 1 nautical mile on the chart equals 80,000 inches on the Earth’s Surface.

A

A. One inch on the chart equals 80,000 inches on the Earth’s Surface

48
Q

Nun buoys may show ONLY:

A. Flashing red lights
B. Flashing green lights
C. White lights
D. Yellow lights

A

A. Flashing red lights

49
Q

A description on a nautical chart noting a “Racon” indicates:

A. Radar conspicuous beacon
B. Radar and radio circular beacon
C. Radar calibration beacon
D. Radar transponder beacon

A

D. Radar transponder beacon

50
Q

Legends printed on a nautical chart in CAPITAL LETTERS show the the associated landmark is:

A

A. Conspicuous
B. Inconspicuous
C. A government facility or station
D. A radio transmitter

51
Q

A non-lateral aid with a red spherical top mark assists in identifying which ATON?

A. Western rivers dayboard
B. A safe water mark
C. Special purpose marks
D. Western rivers aids to navigation

A

B. A safe water mark

52
Q 
When there are 2 high and 2 low tides in a 24-hour period this is called:
A. Interval
B. Mixed
C. Diurnal
D. Semidiurnal
A

D. Semidiurnal

53
Q

You are in-bound on course for the harbor and sight a white lights showing a Morse (a) to port. For safety, you should:
A. Change course to 359T to pass near to the buoy
B. Leave the buoy to port
C. Alter course and lave the buoy well clear to starboard
D. Check the chart to see where the marked danger lies in relation to the buoy

A

B. Leave the buoy to port

54
Q

From seaward you enter the man channel, the buoy numbers on the starboard side of your vessel should:

A. Decrease and the buoys are black
B. Increase and the buoys are green
C. Decrease and the buoys are red
D. Increase and the buoys are red

A

D. Increase and the buoys are red

55
Q

In IALA Region B lateral system “can” buoy is”

A. Lettered
B. Green
C. Red
D. Yellow

A

B. Green

56
Q

The best term that describes the difference between the heights of low and high tide is the:

A. Spring
B. Period
C. Depth
D. Range

A

D. Range

57
Q

Neap tides occur when the sun and moon are:

A. At the start of spring, when the Sun is nearly over the equator
B. Only when the Sun and Moon are on the same sides of the Earth and are nearly in line
C. At right angles to each other
D. When the Sun, Moon, and the Earth are nearly in line, regardless of the alignment order

A

C. At right angles to each other

58
Q

A mid-Channel buoy if lighted, will show a:

A. Fixed green light
B. Alternating light
C. Red light
D. None of the above

A

D. None of the above

59
Q

Spring tides occur when the sun and moon are:

A. At the start of spring, when the Sun is nearly over the equator
B. Only on the same side of the Earth and nearly in line
C. At approximately 90 degrees to each other as seen form the Earth
D. Nearly in line with the Earth.

A

D. Nearly in line with the Earth.

60
Q

You are outbound to the sea in a buoyed channel and observe a quick-flashing green light on a buoy ahead of you. In IALA Region B, you should leave the buoy:

A. Well clear on either side
B. No less than 50 yards off either side
C. To port
D. To starboard

A

D. To starboard

61
Q

Your vessel changes heading to starboard, the compass card in a magnetic compass will:
A. Remain aligned with compass north
B. Also turns to starboard
C. First turns to starboard then counterclockwise to port
D. Turns counterclockwise to port.

A

A. Remain aligned with compass north

62
Q

When entering a Vessel Traffic Separation zone from sea, a lighted Special Purpose buoy to be kept to port and shall have a:

A. Yellow light
B. Green light
C. Red light
D. None of the above

A

A. Yellow light

63
Q

The symbol which appears beside a light on chart reads “Gp F: G (2) 12 sec 160 F 19 M”. Which characteristic of light color does it possess?

A. It has a white light
B. Its distinguishing number is “19M”.
C. It has a green light.
D. It flashes once every twelve seconds.

A

C. It has a green light.

64
Q

Which symbol represents a warm front?

A. Line with blue half circles on one side
B. Line with purple triangles and circles
C. Line with red half circles on one side
D. Line with diamonds

A

C. Line with red half circles on one side

65
Q

When entering from sea in U.S. waters what buoy should be left to port?

A. Even number
B. Composite
C. Nun shape
D. Odd number

A

D. Odd number

66
Q

Lateral buoys which only mark the left or right side of a channel shall NEVER exhibit a light characteristic of:

a) Composite ground flashing (2 + 1)
b) Quick flashing
c) Occulting
d) Equal interval (isophase)

A

a) Composite ground flashing (2 + 1)

67
Q

Which chart projection is most suited for coastal navigation?

a) Gnomonic
b) Lambert conformal
c) Polyconic
d) Mercator

A

d) Mercator

68
Q

To make a corrector to your compass course (PSC) you would find the variation on a Mercator chart:

a) On the mileage scale
b) On the compass rose
c) Polyconic
d) Mercator

A

b) On the compass rose

69
Q

A conical buoy (referred to as a “nun buoy”) will:

a) Be green in color and odd numbered
b) Be red in color and even numbered
c) Be left to port when entering from seaward
d) Be cylindrical in shape

A

b) Be red in color and even numbered

70
Q

The instrument that reads atmosphere pressure difference and changes is:

a) Barometer
b) Anemometer
c) Chronometer
d) None of the above

A

a) Barometer

71
Q

Prior to reading an aneroid barometer, you should tap the face lightly with your finger to:

a) Expose any loose connections
b) Demagnetize the metal elements
c) Contract and expand the glass face
d) Bring the pointer to its true position

A

d) Bring the pointer to its true position

72
Q

A cold front symbol on a water chart is represented by:

a) Line with red triangles
b) Line with blue triangles
c) Line with blue circles
d) line with purple triangles

A

b) Line with blue triangles

73
Q

Fixed yellow lights may appear on:

a) Isolated danger buoys
b) Special purpose buoy
c) Vertically striped buoys
d) Horizontally-banded buoys

A

b) Special purpose buoy

74
Q

The weather forecast states that an occluded front will occur. What is the weather chart symbol?

a) Line with blue circles
b) Line with red and blue circles and triangles
c) Line with red triangles
d) Line with purple half-circles and triangles

A

d) Line with purple half-circles and triangles

75
Q

Which buoy listed below could be used to mark a special anchorage?

a) Yellow buoy lettered “B”
b) White buoy numbered “3”
c) White buoy with a green top “2”
d) White buoy with orange bands

A

a) Yellow buoy lettered “B”

76
Q

Local Notice to Mariners reports dredging operations are underway in your vicinity. Which buoy indicates the dredging area?

a) White buoy with a green top
b) White and international orange buoy
c) Yellow buoy
d) Yellow and black vertically-striped buoy

A

c) Yellow buoy

77
Q

The weather forecast calls for a stationary front. Which weather chart symbol represents this?

a) Line with red circles on one side and blue triangles on the other
b) Line with blue circles
c) Line with purple circles and triangles
d) Line with red circles and blue triangles on the same side

A

a) Line with red circles on one side and blue triangles on the other

78
Q

A white buoy with an orange colored rectangle on it is used to indicate:

a) Danger area
b) A controlled area
c) General information
d) An exclusion area

A

c) General information

79
Q

The chart projection most widely used for navigations is the:

a) Mercator
b) Lambert conformal
c) Azimuthal
d) Gnomonic

A

a) Mercator

80
Q

An Occluded Front is represented by which color line?

a) Red
b) Blue
c) Alternating red and blue
d) Purple

A

d) Purple

81
Q

The description “Racon” alongside an illustration on a chart would mean a:

a) Circular radio beacon
b) Radar conspicuous beacon
c) Radar calibration beacon
d) Radar transponder beacon

A

d) Radar transponder beacon

82
Q

A Line of Position made by sighting two charted objects in a direct line is called a?

a) Relative bearing
b) Dead reckoning
c) Range line
d) Track line

A

c) Range line

83
Q

Chart legends printing in CAPITAL LETTERS show that the associated landmark is:

a) Inconspicuous
b) A radio transmitter
c) A government facility or station
d) None of the above

A

d) None of the above

84
Q

The measure the distance on a Mercator chart between two waypoints, which tool would you use to measure the distance?

a) Weems plotter
b) Dividers
c) Parallel ruler
d) Nautical slide rule

A

b) Dividers

85
Q

Distance along a track line is measured on a Mercator chart by using the:

a) Latitude scale at the bottom of the chart only
b) Longitude scale near the middle of the track line
c) Latitude Scale at the mid-latitude of the chart
d) Latitude scale nearest to the track line

A

d) Latitude scale nearest to the track line

86
Q

If lighted, white lights may be found on:

a) Information and regulatory buoys
b) Special purpose buoys
c) Preferred channels buoys
d) Numbered buoys

A

a) Information and regulatory buoys

87
Q

Conspicuous landmarks on a chart legend are printed in:

a) Capital letters
b) Italics
c) Boldface print
d) Underlined letters

A

a) Capital letters

88
Q

Informational and regularly buoys are:

a) Solid yellow
b) White with orange geometric shapes
c) Red and white vertically-striped
d) Green and red horizontally-banded

A

b) White with orange geometric shapes

89
Q

The rise and fall of the ocean’s surface due to a distant storms is known as

a) Sea
b) Waves
c) Swell
d) Fetch

A

c) Swell

90
Q

Isolated danger buoys on IALA Region B waterways are painted with alternating

a) Red and Black bands
b) Green and black bands
c) Red and white strips
d) Green and white bands

A

a) Red and Black bands

91
Q

Normally weather patterns in the U.S. generally move from:

a) North to south
b) West to east
c) East to west
d) None of the above

A

b) West to east

92
Q

Which federal agency maintains aids to navigation in the U. S.?

a) Army Corps of engineers
b) Homeland Security Agency
c) Coast Guard
d National Ocean Service

A

c) Coast Guard

93
Q

United States Coast Guard is responsible for publishing the:

a) Light Lists
b) U.S. Coast Pilot
c) Radio Navigational Aids
d) List of Lights

A

a) Light Lists

94
Q

What critical source of information is to be used in correcting charts and maintaining them up to date?

a) Fleet Guides
b) Local Notice to Mariners
c) Sailing Directions
d) Pilot Charts

A

b) Local Notice to Mariners

95
Q

The U.S. Coast Pilot (Volumes I through IX) is published by which U.S. government agency?

a) Army Corps of Engineers
b) Defense Mapping Agency
c) National Ocean Service
d) U.S. Coast Guard

A

c) National Ocean Service

96
Q

Light Lists that are published for the U.S. coastal waters are:

a) Correct only to the date of publication and must be updated thereafter
b) Published every year
c) Published every second month
d) Published every five years

A

a) Correct only to the date of publication and must be updated thereafter

97
Q

Compass “deviation is caused by the:

a) Vessels geographic position
b) Vessel’s heading
c) Earth’s magnetic field
d) Influence of the magnetic materials of the vessel

A

d) Influence of the magnetic materials of the vessel

98
Q

Magnetic north varies from true north because of:

a) Compass error
b) Latitude
c) Variation
d) Deviation

A

c) Variation

Sea School OUOV Study guide (3 decks)

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