2 Flashcards

1
Q

Common unit of measurement for atmospheric pressure

A

Inches

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2
Q

Series of brief showers accompanied by strong, shifting winds may occur along some distance ahead of a

A

Cold front

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3
Q

Fog produced by warm moist air over a cold surface

A

Advection fog

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4
Q

Accurate barometer check, check

A

Against radio or National Weather Service reports of the immediate vicinity

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5
Q

Cloud of marked vertical development (often anvil shaped)

A

Cumulonimbus

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6
Q

Buoys which ONLY mark the left or right side of the channel will NOT exhibit which light characteristic?

A

composite group flashing

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7
Q

Nav marks used for info or regulatory purposes are

A

White w orange geometric shapes

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8
Q

Buoy fitted w racon will appear on PPI as

A

Starting with a dash and extending radially outward from target

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9
Q

How are colored sectors of lights listed in the Light List

A

True bearings as observed from ship toward the light

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10
Q

Publication to check for Pugent Sound weather conditions

A

Coast Pilot

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11
Q

In some parts of the world there is a slight fall in tide during the middle of the high water period The effect is to create a longer period of stand at higher water This special feature is called a

A

Double high water

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12
Q

Class of tide that prevails in the greatest # of important harbors on the Atlantic Coast is

A

Semidiurnal

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13
Q

Vessel goes aground in soft mud. You’d have the best chance of refloating on next tide if grounded at

A

Low water spring

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14
Q

Definition of height of tide

A

The vertical distance from the tidal datum to the level of the water at any time

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15
Q

In a river subject to tidal currents, the best time to dock a ship without tugs is

A

At slack water

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16
Q

Slack water occur when there is

A

Little or no horizontal motion of water

17
Q

Current encountered on direct passage from London, England to Cape Town, South Africa?

A

Benguela current

18
Q

Current similar to the Gulf Stream

A

Kuroshio

19
Q

Position which includes effects of wind and current

A

Estimated position

20
Q

Most useful factor in predicting weather

A

The rate an direction of change of barometric readings

21
Q

Scales on aneroid barometers are usually graduated in inches of mercury in the general range of

A

28 to 31 inches

22
Q

What corrections must be applied to an aneroid barometer ?

A

Instrument error and height error

23
Q

You should read the scale of aneroid barometer with eye

A

Directly in front of the pointer

24
Q

Barometric pressure reading 29.92 inches of mercury is equivalent to

A

1013.25 millibars

25
Q

Slow rise in barometric pressure forecasts

A

Improving weather conditions

26
Q

As a high pressure system approaches, the barometer reading

A

Rises

27
Q

Instrument most useful in forecasting fog

A

A sling psychrometer

28
Q

Ascending and descending air masses w diff temps is part of an important heat transmitting process in our atmosphere called

A

Convection

29
Q

Squall lines w almost unbroken line of threatening dark clouds and sharp changes in wind direction, generally precede

A

Fast-moving cold front

30
Q

“horse latitudes”

A

Light airs and calms

31
Q

Force resulting from earths rotation thy causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere

A

Coriolis effect

32
Q

In Northern Hemisphere which semicircle of hurricane is navigable?

A

Left

33
Q

Swells that have outrun the storm are produced in the

A

Right front quadrant

34
Q

Climate of the Northern Gulf Coast

A

Warm marine type of clmate

35
Q

If electronic chart is part of ECDIS, it will NOT display

A

Tidal currents

Ship hydrodynamic information

36
Q

ECDIS MUST be able to perform

A

Conversion of “graphical coordinates” to “display coordinates”
Transformation of local datum to WGS-‘84 datum
Calculation of true azimuth and distance between two geographical points

37
Q

Why option does an Electronic Plotting Aid (EPA) NOT have?

A

Trial Maneuver