Navigation Study Guide Flashcards
The term”Slack Water” during a tidal change means:
A. range of the tide
B. Plane of the tide
C. Little or no movement of water
D. Reversing the tide
A. Little or no movement of water
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:
A. Come left
B. Come right
C. Maintain your current course
D. Waiting until the lights are no longer in a. vertical line.
C. Maintain your current course
You observe a buoy mark having green and red horizontal bands, then will have a light characteristic of:
A. Interrupted quick flashing
B. Morse (A)
C. Quick Flashing
D. Composite group flashing (2+1)
D. Composite group flashing (2+1)
The direction of the earth’s surface wind it:
A. Directed from high pressure toward high pressure
B. Directed by the sun’s solar energy
C. Directed from low pressure towards high pressure
D. Deflected by the earth’s rotation (Coriolis Effect)
D. Deflected by the earth’s rotation (Coriolis Effect)
Your vessel’s position should be plotted using bearings of”
A. Buoys close at hand
B. Buys at a distance
C. Fixed known objects on shore
D. Non of the above
C. Fixed known objects on shore
Which buoy may be lettered but not numbered?
A. Preferred channel buoy
B. Green unlighted can buoy
C. Red lighted buoy
D. Green can buoy
A, Preferred channel buoy
Spring tides will produce:
A. Unpredictable currents
B. Unpredictable tide changes in the spring of the year
C. Higher highs and lower lows than normal
D. Lower highs and lower lows than normal
C. Higher highs and lower lows than normal
You must assume when using a buoy as an aid to navigation:
A. The buoy should be considered to always be in the charted position
B. The buoy may not be in the charted position
C. If lighted, the buoy should be considered to be in the charted position
D. The buoy should be considered to be in the charted position if it has been freshly painted.
B. The buoy may not be in the charted position
The “Local Notice to Mariners” provides corrections of a local nature to charts and is published:
A. Quarterly
B. Monthly
C. Weekly
D. Daily
C. Weekly
The term “Tide” means:
A. Salinity content of the water
B. Mixing of salt and fresh water
C. Horizontal movement of the water
D. Vertical movement of the water
D. Vertical movement of the water
When plotting a voyage, you should:
A. Rely on a buoy to be on station as charted
B. Never rely on a floating buoy to maintain its exact position
C. Rely on a buoy to show proper light characteristics
D. Assume a wreck buoy is directly over the wreck
B. Never rely on a floating buoy to maintain its exact position
The difference in height between low and high tide is referred to as the: A. Period of the tide B. Springtide C. Range of tide D. None of the above
C. Range of tide
From seaward the IALA Region B red and green horizontally-banded buoys refer to:
A. Preferred channels
B. Channels for vessels constrained by draft
C. General anchorage areas
D. None of the above
A. Preferred channels
Determining the heights of land creatures on most charts unless otherwise stated, the “reference datums” is:
A. Mean low water
B. Mean high higher water
D. Mean sea water
C. Mean high water
Red or green lights may appear on:
A. Vertically striped red and white buoys
B. Horizontally banded buoys
C. Yellow buoys
D. Orange buoys
B. Horizontally banded buoys
The depth of the water on a chart is the:
A. Vertical distance from the chart sounding datum to the ocean bottom
B. Vertical distance from the chart sounding datum to the bottom, plus the heights of the tide
C. Average height of water of a specified period of time
D. None of the above
A. Vertical distance from the chart sounding datum to the ocean bottom
A North Hemisphere wind which shifts in a counter clockwise motion is called a:
A. Pressure wind
B. Coriolis wind
C. Veering wind
D. Backing wind
A vessels’s position acquired by using at least three or more bearings is called a:
A. Dead-reckoning position
B. Fix
C. Estimated position
D. Running fix
B. Fix
Mean lower low water (MLLW) 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
A. Sounding on the U. S. east and west coasts
A single line of position combined with a dead-reckoning positions results in a(n):
A. Running fix
B. Estimated position
C. Assumed position
D. Fix
B. Estimated position
The sun and moon align twice each month-what type of tides can be expected?
A. Apogean
B. Perigean
C. Spring
D. Neap
C. Spring
A buoy mark with a composite group-flashing light indicates a:
A. Dredging operation
B. Fishing area only
C. Restricted area
D. Preferred channel
D. Preferred channel
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
D. Mean lower low water
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 counter clockwise manner
C. Increase in velocity
D. Decrease in velocity
B. Shift in a counter clockwise manner
