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Operationally Special 101 > Navigation > Flashcards

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1
Q

Which projection for nautical charts is the most commonly used and shows the earth on cylindrical planes using meridians and parallels? (NAVEDTRA 14308A) [OS3]

A

Mercator

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2
Q

Which projection for nautical charts preserves the natural curvature of the meridians and parallels, but are not commonly used, such as polar charts? (NAVEDTRA 14308A) [OS3]

A

Gnomonic

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3
Q

What lines on a chart run North and South? (NAVEDTRA 14308A) [OS3]

A

Meridian

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4
Q

What lines on a chart run East and West? (NAVEDTRA 14308A) [OS3]

A

Parallel

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5
Q

How many meridians are on a charting grid? (NAVEDTRA 14308A) [OS3]

A

360

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6
Q

The line which passes through Greenwich, England which divide the eastern and western hemispheres is known as the _____. (NAVEDTRA 14308A) [OS3]

A

Prime Meridian

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7
Q

What is the reference for parallels and dividing the northern and southern hemispheres? (NAVEDTRA 14308A) [OS3]

A

Equator

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8
Q

What is the angular distance in degrees, minutes, and seconds of are north and south of the equator? (NAVEDTRA 14308A) [OS3]

A

Latitude

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9
Q

What is the angular distance in degrees, minutes, and seconds of arc east or west of the meridian? (NAVEDTRA 14308A) [OS3]

A

Longitude

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10
Q

1 degree of latitude is considered to be _____ in length. (NAVEDTRA 14308A) [OS3]

A

60 miles

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11
Q

Charts that have a scale of 1:150,000 to 1:600,000 are ______. (NAVEDTRA 14308A) [OS3]

A

General Charts

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12
Q

Charts that have a larger that 1:50,000 are _______. (NAVEDTRA 14308A) [OS3]

A

Harbor Charts

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13
Q

Charts that 1:600,000 or small are ______.(NAVEDTRA 14308A) [OS3]

A

Sailing Charts

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14
Q

Charts with a scale between 1:50,000 to 1:150,000 are _____. (NAVEDTRA 14308A) [OS3]

A

`Coastal Charts

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15
Q

Interpret the following: “FL R 10s 55ft 12M HORN” (NAVEDTRA 14308A) [OS3]

A

Flashing Red, 10 secs, 55 ft. height above mean high water, 12NM visible, Horn sound signal

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16
Q

What is the formula for calculating distance? (NAVEDTRA 14308A) [OS3]

A

Distance (d) = Speed (s) X Time (t)

17
Q

What is the three minute rule? (NAVEDTRA 14308A) [OS3]

A
  • Divide by 100: (if d=800yds, t=3 mins, then s=8 kts)
  • Multiply by 100 (if s=8kts, t=3 mins, then d=800yds)
  • Note, use rule in yards
18
Q

What is the 6-minute rule? (NAVEDTRA 14308A) [OS3]

A
  • Divide by 10 (if s=8kts, t=6mins, then d=.8 NM)
  • Multiply by 10 (if d=.8 NM, t=6mins, then s=8 kts)
  • Note, must convert yards to NM to use
19
Q

On a nautical chart, what color identifies shoal water? (Chart No. 1) [OS3]

A

Light Blue

20
Q

On a nautical chart, what is the symbol and abbreviation for lighthouse? (Chart No. 1) [OS3]

A

Dot with “Lt Ho”

21
Q

On a nautical chart, what is the symbol used to identify obstructions, wrecks, or reefs? (Chart No. 1) [OS3]

A

Dashed or dotted lines around the “Obstn”, “wk” or “reef”

22
Q

Which system utilized aids-to-navigation with red buoys on the starboard side? (Chart No. 1) [OS3]

A

IALA B

23
Q

What symbol is used for a visual or celestial fix? (NAVEDTRA 14308A) [OS3]

A

Circle

24
Q

What symbol is used for an electronic fix? (NAVEDTRA 14308A) [OS3]

A

Triangle

25
Q

What symbol is used for a fix that is from an advanced or previously known position utilizing course and speed but not accounting for wind and current? (NAVEDTRA 14308A) [OS3]

A

Square

26
Q

What type of fix is from an advanced or previously known position utilizing course and speed but not accounting for wind and current? (NAVEDTRA 14308A) [OS3]

A

Dead reckoning

27
Q

What type of fix is the most probably position of a vessel derived from unreliable data or when applying current and wind corrections to a dead reckoning position? (NAVEDTRA 14308A) [OS3]

A

Estimated position

28
Q

What symbol is used to plot a fix that is the most probable position of a vessel using unreliable data? (NAVEDTRA 14308A) [OS3]

A

Square

29
Q

What information do you include when plotting a fix? (NAVEDTRA 14308A) [OS3]

A

Time the fix was taken

Operationally Special 101 (8 decks)

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