Naval Skills Unit Four, Chapter Two: Aids to Navigation
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Which of the navigation light characteristics listed below is considered the most valuable for identification purposes?
Timing interval
Pattern of flashes
Color
Brightness
Height
Of the general patterns of flashes of navigational lights, which type have two or more off periods at regular intervals?
Group occulting
Occulting
Group flashing
Fixed
Flashing
Of the general patterns of flashes of navigational lights, which type show single flashes of light at regular intervals, with the duration of light less than the duration of darkness.
Flashing
Group flashing
Occulting
Group occulting
Fixed
Which variation of navigational light characteristics shows rhythmic lights with different colors during each sequence?
Alternating
Equal interval
Morse code
Occulting
Fixed and flashing
What is the name of the value printed on nautical charts beside the light symbol which represents the distance a light will shine in clear weather?
Why do some lights have sectors of red glass placed in their lanterns?
To show danger bearings.
To allow for more easy recognition during the day.
To allow for more easy recognition at night.
So that white light is seen only from the water and not from the land.
Navigational lights never have sectors of glass painted red.
Why do some lights have sectors of green glass placed in their lanterns?
To indicate a turning point or the best water across a shoal.
To indicate danger sectors due to rocks, shoals or some other hazard.
To allow for more easy recognition during the day.
To allow for more easy recognition at night.
So that white light is seen only from the water and not from the land.
What generally indicates the purpose of a buoy?
Its color
Its size
Its shape
Its lighting
The chart covering the area
If you are sailing southward along the East Coast of the U.S. in the intercoastal waterway, what color and numbering of costal buoys would you expect to see on the starboard side of the ship?
Red and even-numbered
Red and odd-numbered
Green and even-numbered
Green and odd-numbered
Yellow and even-numbered
Which type of buoys consist of upright wooden poles or tubes of steel?
Spar buoys
Can buoys
Nun buoys
Bell buoys
Gong buoys
Which type of buoys are shaped like a cylinder, much like an oil drum?
Can buoys
Spar buoys
Nun buoys
Bell buoys
Gong buoys
If unlighted, red right-hand channel buoys must be what type of buoys?
Nun buoys
Can buoys
Spar buoys
Bell buoys
Lighted buoys
Green and red horizontally banded buoys are known as what?
Preferred-channel buoys
Bell buoys
Nun buoys
Spar buoys
Safe-water buoys
What type of buoy would be colored with green and red horizontal bands?
Preferred-channel buoys
Safe-water buoys
An anchorage area buoy
A fish trap area buoy
A quarantine anchorage buoy
What type of buoy would be colored with red and white vertical stripes?
Safe Water buoys
Preferred-channel buoys
Anchorage buoys
Fish Trap buoys
Quarantine anchorage buoys
What type of buoy would be colored yellow?
Quarantine anchorage buoys
Fish trap buoys
Anchorage buoys
Dredging buoys
Safe-water buoys
How are dredging areas normally marked?
White buoys with green tops
Yellow buoys
With black and white horizontal striped buoys
Green and red horizontally banded buoys
Red and white vertically striped buoys
Informational buoys are cylindrical white buoys with what additional color markings?
Orange
Red
Black
Green
Yellow
Red buoys marking the ________ side of a channel when coming into port bear _____ numbering.
Right, Even
Right, Odd
Left, Even
Left, Odd
Right, Even and Odd
Which of the following is TRUE concerning the markings on banded or striped buoys?
They are not numbered, but some have letters identifying the name of the buoy.
The are numbered with even numbers.
They are numbered with odd numbers.
The have both letters and numbers, depending on the type of buoy.
They are not marked with either letters nor numbers.
What type of lights would you find on safe-water (mid-channel) buoys.
Only white lights
Only red lights
Only green lights
Both red and green lights
All three colors of lights are used. Red, Green and White.
What type of flashing light is normally found on a red and white vertically striped safe-water buoy?
A Morse A flashing light
A quick-flashing light
A fixed light
An interrupted quick-flashing light
A flashing light which flashes at not more than thirty flashes per minute.
Green or red channel buoys would NOT have which of the following lights?
A Morse A flashing light
A quick-flashing light
A flashing light
A fixed light
All of these types of lights can be found on green or red channel buoys
What type of light would you find at a turning point or junction where special caution is required?
Quick-flashing
Flashing
Fixed
Interrupted quick-flashing
Morse A flashing
Unlighted structural aids to navigation are called what?
Daybeacons
Daymarks
Lighthouses
Channel Markers
Light Towers
What color is found on every buoy, daymark or light structure along the Intercoastal Waterway?