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Captains Licence > Piloting and Navigation General > Flashcards

Piloting and Navigation General Flashcards

1
Q

Which daymark shape is used in the lateral system?

A

Triangle

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2
Q

A triangular daymark would be marked with the following color(s) ______________________.

A

Red

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3
Q

The annual change for variation for an area can be found in…

A

The center of the compass rose on a chart of the area

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4
Q

The light rhythm of Morse (A) is found on ____________________.

A

Safe water buoys

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5
Q

Under the IALA-B Buoyage System, a conical buoy is _________________.

A

red in color

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6
Q

A nun buoy will ____________________.

A

have an even number

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7
Q

You are steering on a pair of range lights and find the upper light is above the lower light you should _______________.
Continue on present course

A

Continue on present course

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8
Q

In the U.S. Aids to Navigation System, red and green horizontally banded buoys are used to mark ________________________.

A

Junctions or bifurcation

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9
Q

Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light listed in the light list in which of the following manners?

A

True bearings as observed from the ship toward the light

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10
Q

The time required for a lighted aid to complete a full cycle of light changes is called its…

A

Period

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11
Q

Which buoy listed below may be odd numbered?

A

Unlighted can buoy

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12
Q

Chart legends printed in capital letters show that the associated landmark is…

A

Conspicuous

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13
Q

Which navigational mark may only be lettered?

A

A spherical buoy

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14
Q

What are the characteristics associated with an isophase light?

A

1 sec. Flash, 1 sec. Eclipse

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15
Q

Buoys may be marked with reflective material to assist in their detection by search light. Which statement is true?

A

A preferred-channel buoy displays either red or green reflective material to agree with the top band of color

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16
Q

What are the colors of a mid-channel daymark?

A

Red and white

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17
Q

Red lights may appear on ________________.

A

Horizontally banded buoys

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18
Q

When entering from seaward, a starboard side daymark will ________________________.

A

have an even number if numbered

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19
Q

Which buoy from the list below may be even numbered?

A

Unlighted nun buoy

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20
Q

Which feature(s) of a daymark is (are) used to identify the beacon upon which it is mounted?

A

Color and shape

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21
Q

Magnetic heading differs from compass heading by ________________.

A

Deviation

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22
Q

If the compass heading and the magnetic heading are the same, then __________________.

A

There is no deviation on that heading

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23
Q

Compass error is equal to the ___________________.

A

total effect of variation and deviation taken together

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24
Q

If the magnetic heading is greater than the compass heading, the deviation is __________________.

A

East

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25
Q

In applying variation to a true course to obtain a magnetic course ___________________.

A

you should subtract east and add west

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26
Q

Variation is not constant; it is different with every change in __________.

A

geographic location

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27
Q

If a magnetic compass is not affected by any magnetic field other than the earth’s, which statement is true?

A

Compass error and variation are equal

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28
Q

The difference in degrees between true north and magnetic north is called ____________________.

A

Variation

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29
Q

In going from magnetic to true, you must _______________________.

A

add easterly variation or subtract westerly variation

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30
Q

The lubber’s line on a magnetic compass indicates__________.

A

the direction in which the boat’s bow is heading.

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31
Q

Deviation is caused by ____________________.

A

Magnetic influence inherent to that particular vessel

32
Q

To find a magnetic compass course from a true course you must apply ________________________.

A

Deviation and variation

33
Q

As a vessel changes course to starboard, the compass card in a magnetic compass ____________.

A

remains aligned with compass north

34
Q

The most important feature of the material used for making the binnacle of a standard magnetic compass is that it is__________.

A

nonmagnetic

35
Q

Deviation is not constant; it is different with every change in…

A

Vessel heading

36
Q

The point where the vertical rise or fall of tide has stopped is referred to as ___________.

A

The stand of the tide

37
Q

The movement of water away from shore is called a(n) ____________.

A

Ebb current

38
Q

The difference between the heights of low and high tide is the _____________.

A

Range

39
Q

The drift and set of tidal, river, and ocean currents refer to the __________________.

A

Speed and direction toward which current flows.

40
Q

The term “tide” refers to

A

Vertical movement of the water

41
Q

A tide is called diurnal when ____________.

A

Only one high and one low water occur during a lunar day.

42
Q

When the moon is either new or full which type of tides occur?

A

Spring

43
Q

Information about currents on the Pacific Coast of the U.S. can be found in the ______________.

A

Tidal Current Tables

44
Q

The distance between the surface of the water and the tidal datum is the ____________.

A

Height of tide

45
Q

To predict the actual depth of water using the Tide Tables the number obtained from the Tide Tables is ______________.

A

Added or subtracted to the charted depth

46
Q

Spring tides occur ___________________.

A

When the Sun, Moon, and Earth are nearly in-line, in any order

47
Q

Which term refers to the direction a current is flowing?

A

Set

48
Q

The datum from which the predicted heights of tides are reckoned in the tide tables is ______.

A

The same as that used for the charts of the locality

49
Q

Where would you find information about the time of high tide at a specific location on a particular day of the year?

A

Tide Tables

50
Q

The term “flood Current” refers to that time period when the water _______________.

A

Is flowing towards land

51
Q

To safely anchor a vessel there must be sufficient scope in the anchor cable. Scope is the ratio of_______________.

A

The length of the anchor line or anchor rode to the depth of the water

52
Q

The holding power of an anchor is primarily determined by the ___________.

A

Anchor’s ability to dig in

53
Q

The best method of determining if a vessel is dragging anchor is to note _________.

A

Changes in bearings of fixed objects onshore

54
Q

The best method of determining if a vessel is dragging anchor is to note _________.

A

Changes in bearings of fixed objects onshore

55
Q

What is the normal length of anchor rode used to anchor a vessel?

A

Five to seven times the depth of water

56
Q

The best method to stop a vessel from dragging anchor is to _________.

A

Pay out more anchor rode

57
Q

By paying out more anchor rode, you_________.

A

Increase the holding power of your anchor

58
Q

Which type of bottom, listed below, is best suited for holding an anchor of a small boat?

A

A mixture of mud and clay

59
Q

Using a scope of 6, determine how much anchor rode you should put out to anchor in 12 feet (3.7 meters) of water.

A

72 feet (21.9 meters)

60
Q

The holding power of an anchor at a given scope of cable increases when the ___________.

A

Amount of chain lying along the bottom increases

61
Q

While anchoring your vessel, the best time to let go the anchor is when the vessel is ___________.

A

Making slight sternway due to wind or current

62
Q

A sufficient amount of anchor rode must be used when anchoring a vessel to ensure ____________.

A

The anchor flukes bite into the bottom of the seabed

63
Q

Which part of the anchor actually digs into the bottom and provide holding power?

A

Fluke

64
Q

When a small craft’s anchor refuses to break free, the operator should ___________.

A

Run in a wide circle, slowly, to change the angle of pull

65
Q

You are approaching a RACON it may be identified on the radar by __________.

A

A coded signal appearing on the same bearing at a greater range.

66
Q

The ability of radar to detect objects is unaffected by weather conditions, especially dense rain. TRUE or FALSE

A

FALSE

67
Q

Small wooden boats may not show up on radar. TRUE or FALSE

A

TRUE

68
Q

The highest level of navigational accuracy is provided by __________.

A

DGPS

69
Q

Radar may be used at night in low visibility conditions. TRUE or FALSE

A

TRUE

70
Q

An electronic depth finder operates on the principle that __________.

A

Sound waves travel at a constant speed through the water

71
Q

A fathometer shows the depth from ________.

A

The bottom of the vessel to the seabed

72
Q

What does not contribute to the accuracy of a GPS?

A

Ship’s speed

73
Q

What should you apply to a Fathometer reading to determine the actual depth of water?

A

Add the draft of the vessel.

74
Q

The description “RACON” besides an illustration on a chart would mean a __________?

A

Radar Transponder Beacon

75
Q

In modern depth indicating equipment the sonic or ultrasonic sound signals are produced electrically by means of a(n)

A

Transducer

76
Q

When using GPS (Global Positioning System) you may expect your position to be accurate within a radius of

A

20 meters

77
Q

All modern depth sounders can measure the __________.

A

Depth of the water below the location of the transducer

Captains Licence (4 decks)

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