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Questions and Answers
What type of position is derived by factoring in only the vessel's course and speed from a confirmed location?
What type of position is derived by factoring in only the vessel's course and speed from a confirmed location?
Which position is obtained when estimated current and wind are applied to the vessel's course and speed?
Which position is obtained when estimated current and wind are applied to the vessel's course and speed?
A barometric pressure reading of 29.92 inches of mercury is equivalent to which of the following?
A barometric pressure reading of 29.92 inches of mercury is equivalent to which of the following?
Apparent altitude is sextant altitude corrected for what?
Apparent altitude is sextant altitude corrected for what?
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Where is information regarding the direction and velocity of rotary tidal currents typically located?
Where is information regarding the direction and velocity of rotary tidal currents typically located?
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What is the approximate speed of sound in water?
What is the approximate speed of sound in water?
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What is the typical frequency of the low-frequency pulse emitted by an echo sounder?
What is the typical frequency of the low-frequency pulse emitted by an echo sounder?
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On an echo sounder, which component is used to mark specific times or events on the recording paper?
On an echo sounder, which component is used to mark specific times or events on the recording paper?
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On a nautical chart, where would you typically find the chart number?
On a nautical chart, where would you typically find the chart number?
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The visibility range of lights indicated on nautical charts is given in nautical miles based on what factor?
The visibility range of lights indicated on nautical charts is given in nautical miles based on what factor?
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What type of projection is used to create a Mercator chart?
What type of projection is used to create a Mercator chart?
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On a nautical chart, which abbreviation indicates that the seabed is composed of coral?
On a nautical chart, which abbreviation indicates that the seabed is composed of coral?
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Which publication provides detailed ocean current information for voyage planning, specifically for a route from Tokyo to San Francisco?
Which publication provides detailed ocean current information for voyage planning, specifically for a route from Tokyo to San Francisco?
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What term describes the altitude of a celestial body after applying corrections for Dip and index error?
What term describes the altitude of a celestial body after applying corrections for Dip and index error?
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When performing celestial navigation, a phase correction is specifically applied to observations of which celestial body?
When performing celestial navigation, a phase correction is specifically applied to observations of which celestial body?
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What is the term for the angle between the grid meridian and the magnetic meridian?
What is the term for the angle between the grid meridian and the magnetic meridian?
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What phenomenon causes the axis of a rotating object to wobble when a torque is applied?
What phenomenon causes the axis of a rotating object to wobble when a torque is applied?
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What type of error in a gyrocompass is caused by rapid changes in course, speed, and latitude, leading to deviation before the gyro can adjust?
What type of error in a gyrocompass is caused by rapid changes in course, speed, and latitude, leading to deviation before the gyro can adjust?
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What is the primary function of a Flinders bar on a magnetic compass?
What is the primary function of a Flinders bar on a magnetic compass?
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A vessel's heading is $330°$ PGC and $345°$ PSC, with a $2°$ E gyro error. If the variation is $10°$ W, what is the deviation on this heading?
A vessel's heading is $330°$ PGC and $345°$ PSC, with a $2°$ E gyro error. If the variation is $10°$ W, what is the deviation on this heading?
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What geometric feature defines the shortest distance between any two points on Earth?
What geometric feature defines the shortest distance between any two points on Earth?
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Which chart type is most suitable for representing a very large geographical area with less detail?
Which chart type is most suitable for representing a very large geographical area with less detail?
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According to the content, who is ultimately responsible for the vessel?
According to the content, who is ultimately responsible for the vessel?
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What crucial information should a new helmsman receive when relieving the helm?
What crucial information should a new helmsman receive when relieving the helm?
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If a crew member falls overboard on your port side, what immediate action is generally recommended?
If a crew member falls overboard on your port side, what immediate action is generally recommended?
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What information must a casualty report include regarding a vessel involved in an incident?
What information must a casualty report include regarding a vessel involved in an incident?
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Which of the following terms describes the change in magnetic variation over time?
Which of the following terms describes the change in magnetic variation over time?
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Which of these scenarios necessitates furnishing a notice of marine casualty to the coast guard?
Which of these scenarios necessitates furnishing a notice of marine casualty to the coast guard?
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What is the standard atmospheric pressure at sea level, expressed in millimeters of mercury?
What is the standard atmospheric pressure at sea level, expressed in millimeters of mercury?
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A vessel on gyro-pilot slowly veers to the right. After hand steering, what is the next appropriate action?
A vessel on gyro-pilot slowly veers to the right. After hand steering, what is the next appropriate action?
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What is the angular distance from the Tropic of Cancer ($23\degree 27'$ N) to the Arctic Circle?
What is the angular distance from the Tropic of Cancer ($23\degree 27'$ N) to the Arctic Circle?
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The automatic device for steering a ship using signals from a gyro compass is known as a _____.
The automatic device for steering a ship using signals from a gyro compass is known as a _____.
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What approximately is the length of one nautical mile?
What approximately is the length of one nautical mile?
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What is defined as the period when the sun's center is between $6\degree$ and $12\degree$ below the horizon?
What is defined as the period when the sun's center is between $6\degree$ and $12\degree$ below the horizon?
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Which meridian serves as the boundary between the +4 and +5 zone descriptions?
Which meridian serves as the boundary between the +4 and +5 zone descriptions?
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Flashcards
Visibility of lights in nautical miles
Visibility of lights in nautical miles
Indicates the charted, luminous, or geographic range of a light.
Mercator Chart
Mercator Chart
A Mercator Chart is a cylindrical projection used for navigation.
Chart symbol for coral
Chart symbol for coral
The symbol that indicates coral on a chart is 'Cl'.
Publication for ocean currents
Publication for ocean currents
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Altitude after Dip correction
Altitude after Dip correction
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Phase correction applications
Phase correction applications
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GPS Position Accuracy
GPS Position Accuracy
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Gyro compass reaction
Gyro compass reaction
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Dead-reckoning
Dead-reckoning
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Estimated position
Estimated position
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Barometric pressure conversion
Barometric pressure conversion
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Apparent altitude
Apparent altitude
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Tidal Current Tables
Tidal Current Tables
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Speed of sound in water
Speed of sound in water
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Event marker (echo sounder)
Event marker (echo sounder)
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False echoes
False echoes
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Gyrocompass stream error
Gyrocompass stream error
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Flinders bar
Flinders bar
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Deviation on heading
Deviation on heading
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Great circle
Great circle
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Small scale chart
Small scale chart
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Isogonic lines
Isogonic lines
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Torque-induced precession
Torque-induced precession
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Compass deviation correction
Compass deviation correction
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Standard atmospheric pressure
Standard atmospheric pressure
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Gyro-pilot function
Gyro-pilot function
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Length of a nautical mile
Length of a nautical mile
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Nautical twilight
Nautical twilight
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Arctic Circle distance
Arctic Circle distance
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East Cardinal Mark color
East Cardinal Mark color
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Wave bending term
Wave bending term
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Voyage plan responsibility
Voyage plan responsibility
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Navigation Officer
Navigation Officer
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New Helmsman Responsibilities
New Helmsman Responsibilities
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Immediate Action for Man Overboard
Immediate Action for Man Overboard
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Marine Casualty Report Requirements
Marine Casualty Report Requirements
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Notice of Marine Casualty to Coast Guard
Notice of Marine Casualty to Coast Guard
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Study Notes
Competency 1 Assessment - Deck
-
Position Determination:
- Dead-reckoning: Position calculated using only vessel's course and speed from a known position.
- Estimated Position: Position calculated using estimated current and wind, in addition to vessel's course and speed.
- Probable Position: Position estimated based on data which is not precise.
- Applied Position: Position calculated using applied current and wind from known position
- Fix: Exact position determined by multiple methods.
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Barometric Pressure:
- 29.92 inches of mercury is equivalent to 1013.25 millibars.
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Apparent Altitude:
- Sextant altitude corrected for reading and reference level inaccuracies, double-second difference, chronometer error, and dip.
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Tidal Currents:
- Data about the direction and velocity of rotary tidal currents can be found in Tidal Current Tables.
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Speed of Sound in Water:
- 1.44 kilometers per second.
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Echo Sounder Frequency:
- Low frequency pulse of the echo sounder is 24 kHz.
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Echo Sounder Line Marking:
- Event marker (used to mark events on the plotted line).
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Water Salinity Effect on Sound:
- Increases the speed of sound.
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Nature of Echo Sounder Beam:
- Directional.
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Echo Sounder Transducer Types:
- Magnetostriction is one transducer type.
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False Echoes in Echo Sounder:
- Causes include turbulence from tidal streams, schools of large fish, and bioluminescent microorganisms in the water.
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Torque-Induced Precession:
- Wobbling of an object's axis when torque is applied.
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Gyrocompass Errors:
- Stream error results from rapid changes in course, speed or latitude causing errors before gyrocompass can adjust.
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Flinders Bar on Compass:
- Correct statement: compensates for error caused by the vertical component of the Earth's magnetic field.
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Determining Deviation (Heading):
- Gyro error, variation and deviation should all be considered.
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Distance between points on Earth:
- Shortest distance is defined as a great circle.
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Charts covering large areas:
- Small-scale charts cover larger areas.
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Isogonic Lines:
- Indicate lines of equal magnetic variation on a chart.
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Chart Revisions:
- Printed in the lower left center of the chart.
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Light Visibility on Charts:
- Typically measured in nautical miles for charted and luminous ranges.
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Mercator Chart Projection:
- A cylindrical projection.
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Coral Chart Symbol:
- Typically a symbol of an orange or red cross-hatched pattern.
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Ocean Current Information Source (Voyage Planning):
- Sailing Directions.
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GPS Accuracy:
- Accuracy is expected to be 95% within 100 meters (for GPS).
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DGPS Accuracy:
- Accuracy within 10 meters is expected with DGPS navigation systems.
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Magnetic Variation:
- The angle between the grid and magnetic meridians is known as variation.
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Steering Compass (Gyro effect):
- Gyro compass reaction to force is known as precession.
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Navigation Instrument (Bearing and Course):
- Compass and Pelorus.
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Compass Rose Indicator (Nautical chart):
- Variation and deviation are indicated.
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Atmospheric pressure:
- Standard is 760 mm of mercury.
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Navigational Actions (problems):
- When Notice Vessel's course is slowly changing right—switch to hand steering and then immediately notify the engineroom.
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Arctic Circle Latitude:
- 66.5 degrees North.
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Automatic Steering Device:
- Gyropilot is automatic steering device using a gyrocompass.
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Nautical Mile:
- 6,076 feet, 1.852 kilometers
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Twilight Interval:
- Astronomical twilight defines the time when the center of the sun is 12 degrees below the horizon.
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Notices of Marine Casualty
- Notice needed for incidents involving damage to the vessel, or to the cargo.
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Description
Test your knowledge on essential nautical concepts including vessel positioning, sound speed in water, and chart specifics. This quiz covers a range of topics relevant to navigation and maritime operations. Sharpen your skills and ensure you comprehend key principles in coastal and marine navigation.
