Intro to Nav Flashcards
One degree of latitude equals?
60nm
One minute of latitude equals?
1nm
Most charts used for piloting are?
Mercator Projections
A Mercator chart is what kind of projection?
Cylindrical
On a Mercator Chart, 1nm is equal to?
1 min of latitude
Is the date of the first edition found in the chart title?
No
Large scale charts cover?
Relatively small areas
Charts covering relatively large areas in generalized details are?
small scale charts
The revision date of a chart is printed where?
lower left-corner
Chart sounding datum is found?
In the chart title
The datum used for soundings on charts of the East Coast of the US is?
mean lower low water
Survey info is found?
Chart title
Outer ring of the compass rose on a nautical chart?
True direction
Inner ring of a compass rose on a nautical chart?
magnetic direction
Chart legends printed in capital letters show?
That the associated landmark is conspicuous
When slanted letters are used to spell the name of a charted object you know?
That the object may cover and uncover with tide
If you’re headed southward along the east coast of the US, you encounter a buoy showing a red flashing light; you should pass this buoy by leaving it to?
starboard
Preferred channel buoys indicate the preferred channel to transit by?
The color of their top band
Nun buoys?
Unlighted, red and green, horizontally banded buoys with the topmost band red and are conical in shape
Are preferred channel buoys numbered?
NO
May preferred channel buoys be lettered?
yes
A lighted buoy with a spherical topmark marks?
safe water
Can spherical buoys be lettered?
yes
A safe water daymark?
Octagon
What does an odd number on a buoy indicate?
Should be left to port when entering from seaward
Unlighted can buoy may be numbered?
Odd
Unlighted nun buoy may be numbered?
even
Red lights may appear on?
horizontally banded buoys
A vertically stripped buoy may be lighted?
with a white light
A buoy having red and white vertical stripes has a light characteristic of?
Morse (A)
Yellow buoy may mark?
a fish net area, or an anchorage area
Navigational marks used for informational or regulatory purposes are?
white with orange geometric shapes
A white buoy with an open-faced orange diamond on it indicates?
danger
A white diamond daymark with an orange border is?
an information regulatory mark
A white buoy with a blue band is?
a mooring buoy
A fixed red light signal on a drawbridge indicates?
the draw will not be opened immediately
Color sectors may indicate?
dangerous waters, the best way across a shoal or indicate a turning point in a channel
red sector navigation lights warn?
mariners of shoals or nearby land
On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector, the red sector indicates?
Danger area
A triangular daymark would be colored?
red
A square daymark would be colored?
green
A mid-channel daymark would be colored?
red and white
Portside daymarks may be numbered?
yes
A light having characteristics which include color variations is defined as?
Alternating
A light that has a period shorter than its dark period is described as?
flashing
A lateral system buoy displaying a quick flashing light indicates?
That special caution is required
Isophase light?
1 sec. Flash, 1 sec. eclipse
The intensity of a light is expressed as?
The nominal range in the Light List
When a buoy is in position only during certain periods of the year the dates of when it is in position are found?
In the Light List
What info concerning lighted aids to navigation may be read directly from the Light List?
location, height above water and luminous range
