Nav General Study set 1

1
"Slack Water"

3
You observe a buoy mark having green and red horizontal bands it will have a light characteristic of?

4
The direction of the earth's surface wind is?

6
Which buoy may be lettered and not numbered?

Preferred channel buoy

Green unlighted can buoy

Red lighted buoy

Green Can buoy

14
Determining the heights of land features on most charts unless otherwise stated the "reference datum" is?

15
Red or green lights may appear on what kind of buoys?

16
The depth of the water on a chart is the?

7

Spring tides will produce?

Unpredictable tide changes in the spring of the year?

Higher highs and lower lows than normal?

Lower highs and higher lows than normal?

8
You must assume when using a buoy as an aid to navigation?

The buoy should be considered to always be in the charted location.

The buoy may not be in the charted position

9
The "Local Notice to Mariners" provides corrections of local nature to charts and is published?

10
The term "Tide" means?

11
When plotting a voyage, you should?

 Rely on a buoy to be on station as charted

Never rely on a floating buoy to maintain its exact position

Rely on a buoy to show proper light characteristics

Assume a wreck buoy is directly over the wreck

12
The difference in height between low and high tide is referred as the ?

Period of tide

Spring tide

Range of tide

2
When entering a channel from the sea and decide to check your compass heading you steer on a pair of range lights and find the upper light is in line with the lower light you should?

Come left

Come right

Maintain your current course

Wait until the lights are no longer in a vertical line

5
Your vessl's position should be plotted using bearings of?

Buoys close at hand

Buoys at a distance

Fixed known objects on shore

13
From seaward the IALA region B red and green horizontally banded buoys refer to?

Preferred channels

Channels for vessels constrained by draft

General anchorage areas

19.
Mean lower low water (MILLW is the reference plane used for

a. Sounding on the U.S. east and west coasts
b. All vertical gulf measurements
c. Heights above water for lights, mountains, etc.
d. Soundings on the U.S. east coast only

20.
A single line of position combined with a dead-reckoning position results in a(n)

a. Running fix
b. Estimated position
c. Assumed position
d. Fix

21.
The sun and moon align twice each month--what type of tides can be expected?

a. Apogean
b. Perigean
c. Spring
d. Neap

22.
A buoy mark with a composite group-flashing light indicates a

a. Dredging operation
b. Fishing area only
c. Restricted area
d. Preferred channel

23.
On the U.S. east and west coasts charted depths are taken from

a. Means sea level
b. Mean high level
c. Mean low water
d. Mean lower low water

24.
A weather forecast expects a "backing" wind. In the Northern Hemisphere, this would indicate that it will
•

a. Shift in a clockwise manner
b. Shift in a counterclockwise manner
c. Increase in velocity
d. Decrease in velocity

25.
What type of tides occur when the sun and moon are at right angles (90 degrees) to eachother?

a. Neap
b.Spring
c.Diurnal
d.Semi-diurnal

17
A North Hemisphere wind which shifts in a counterclockwise motion is called a?

a.Pressure wind
b.Coriolis wind
c.Veering wind
d.Backing wind

18
A vessels position acquired by using at least three or more bearings are called a?

a.Dead reckoning position
b.Fix
c.Estimated position
d.Running fix

26.
If lighted preferred-channel buoy will show a

a.Orange light whose characteristic is Morse (A)
b.Composite group-flashing (Morse (A)) white light
C.Composite group-flashing (2+1) red or green light
d.Composite group-flashing (2+1) orange light

27.
A weather forecast expects a "veering" wind. In the Northern Hemisphere, this would indicate that it will

a.Shift in a clockwise manner
b.Shift in a counterclockwise manner
c.Continue blowing from the same direction
d.Increase in velocity