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Navigation I
NSI
40
Other
Not Applicable
02/28/2005

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Cards

Term
Define navigation.
Definition
The process of directing the movements of a vessel from one place to another safely and efficiently.
Term
Small Circle
Definition
Parallels of Latitude except Equator
Term
Great Circles
Definition
All Longitiude Lines and the Equator
Term
What are Sector Lights?
Definition
Red Lights used in Dangerous Sectors. White Light in Safe Area
sector limits are expressed in degrees true as observed from a vessel, not from the lights
Term
What color are port buoys and how are they numbered?
Definition
green, and they're odd numbered.
Term
What color are starboard buoys and how are they numbered?
Definition
red, and even numbered
Term
Who are the members of the plotting team?
Definition
Navigator, plotter, bearing taker, bearing recorder and in CIC - the piloting officer, radar operator, and plotter.
Term
Define degrees of Longitude.
Definition
180 degrees west to 180 degrees east, and always use 3 digits
Term
Define degrees of latitude.
Definition
90N to 90S
Term
What is a Rhumb Line?
Definition
Intersects different lines of longitude at equal angles.
Term
What is a Rhumb Line?
Definition
Intersects different lines of longitude at equal angles.
Term
When is a Rhumb line straight?
Definition
On the Mercator chart.
Term
What is a map?
Definition
Seperated by political boundaries.
Term
What is a chart?
Definition
It is primarily concerned with depicting navigable water areas.
Term
What is the fleet guide?
Definition
It contains information on naval bases in the US and in foreign counties.
Term
What is the publication that is a narrative of navigation and related information for foreign waters that cannot be shown on a chart?
Definition
Sailing directions.
Term
What is the List of Lights?
Definition
Describes aids to navigation found in foreign waters and selected U.S. coastal regions
Term
What is the Light List?
Definition
Lists aids to navigation in U.S. waters
Term
What is the Coastal Pilot?
Definition
Provide supplemental information about navigation in U.S. coastal waters
Term
How do you know when charts have been updated?
Definition
By messages in the Notice to Mariners.
Term
What is a large scale chart?
Definition
Show small areas; are more magnified.
Term
What is a small scale chart?
Definition
Show large areas; are less magnified.
Term
What is a channel buoy?
Definition
It tells you the preferred side of the channel to transit in. Red on top and green on bottom means stay to the port side of the channel. Green on top, red on bottom means stay on starboard side.
Term
What is a safe-water buoy?
Definition
It has red and white vertical stripes and tells you where safe water is.
Term
What is the difference between a gyro compass and a magnetic compass?
Definition
A gyro compass seeks true north, while a magnetic compass seeks magnetic north.
Term
What are the advantages of a magnetic compass?
Definition
Does not need power, requires little to no maintenance, and durable
Term
What are the disadvantages of the magnetic compass?
Definition
Can not be used near the poles, does not seek true north, it is affected by the surrounding materials
Term
What are the advantages of the gyro compass?
Definition
Can be used near the earth’s magnetic poles, where magnetic compass is useless, Unaffected by surrounding material,Signal can be fed to other systems (INS, fire control, automatic steering)
Term
What are the disadvantages of the gyro compass?
Definition
intricate electronic instrument, requires constant electrical power, sensitive to power fluctuations, requires periodic maintenance
Term
Define IALA A.
Definition
International Association of Lighthouses for foreign sea's buoy patterns, red on port, green on starboard(opposite of IALA B)
Term
Define IALA B.
Definition
International Association of Lighthouses for US sea buoy patterns, red right return, green port (opposite of IALA A)
Term
What is luminous range?
Definition
The maximum distance at which a light may be seen under the current meteorological conditions.
Term
What is the nominal range of a light?
Definition
The distance a light can be seen in “clear” weather. Also called the CHARTED RANGE because you find this number on the chart!
Term
What is the geographic range of a light?
Definition
The distance at which a light can be seen in perfect visibility (taking into account elevation, observer’s height of eye, and the curvature of the earth).
Term
How do you convert feet to nautical miles?
Definition
1.169 times the sq. root of the height
Term
What is computed range?
Definition
Computed range is taking the lesser of the nominal or the geographic range.
Term
When is the nominal range equal to the luminous range?
Definition
10 nautical miles
Term
What does "True Virgins Make Dull companions At Weddings!" mean?
Definition
Way to calculate compass calculations.
Term
If gyro heading is best(greater than true heading) then direction of error is _____.
Definition
West!!
Term
If gyro heading is least(less than true heading) then gyro error is ____.
Definition
East.
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