Beaufort Scale: Wind Speed of Force 8

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Questions and Answers

What is the speed of the wind in a beaufort force 8?

Wind speed 41 to 47 knots mean 44 knots

Wind speed 48 to 55 knots mean 52 knots

Wind speed 34 to 40 knots mean 37 knots (correct)

Wind speed 28 to 33 knots mean 30 knots

If the center of low is directly ahead, what is the wind speed?

1.9 knots

2.1 knots (correct)

2.3 knots

1.7 knots

How often are Notice to Mariners published?

Annually

Monthly (correct)

Weekly

Quarterly

What is the nature of the beam transmitted by an echo sounder?

Pulsed Signup and view all the answers

What is the shape of the Starboard hand lateral marks used in IALA Region B?

Triangle Signup and view all the answers

What is the effect of low humidity on evaporation?

It speeds up evaporation Signup and view all the answers

What does a type of cloud at a low angle of elevation represent?

Precursor of bad weather Signup and view all the answers

How do sea ice and icebergs move in an area where they are present?

They move in the same direction and at the same speed Signup and view all the answers

How can RADAR be an aid to weather forecasting?

Only when weather messages are incomplete or not available Signup and view all the answers

What is the purpose of a detailed passage plan in coastal navigation?

To include weather forecasts and coordinate watchkeeping Signup and view all the answers

What is the characteristic of an iceberg compared to sea ice?

It moves in a different direction Signup and view all the answers

What is the result of increasing the height in feet above sea level by 10 percent and dividing by 30?

Correction in hectopascals to be added Signup and view all the answers

What is the characteristic of a cloud with a 2000 feet thickness?

Cloud tops are lower than the freezing level Signup and view all the answers

What is the purpose of a device that requires four sphere of position lines?

To determine the position of an object Signup and view all the answers

What is the result of increasing the height in feet above sea level by 5 percent and dividing by 20?

Correction in hectopascals to be added Signup and view all the answers

What is the characteristic of a cloud with a 4000 feet thickness?

Cloud tops are higher than the freezing level Signup and view all the answers

What is the purpose of a device that measures the temperature of the atmosphere?

To measure the temperature of the atmosphere Signup and view all the answers

What is the importance of a triangle formed by three position lines?

It provides a range of possible positions for the vessel Signup and view all the answers

What is the measurement of the angle between the horizontal and magnetic line of force?

Vertical angle Signup and view all the answers

What is the minimum under keel clearance required over a rock of drying height 0.9 meters, given the vessel's draught is 2.5 meters and the height of HW is 3.8 meters?

0.3 meters Signup and view all the answers

What is the term for the ratio of the existing water vapour to its saturation value at the same temperature?

Relative humidity Signup and view all the answers

What is the instrument that measures the temperature to which air must be cooled at constant pressure and constant water vapour content?

Psychometer Signup and view all the answers

What is the term for the error that occurs when a vessel's position is plotted at the point of intersection of the line outside the triangle?

Local error Signup and view all the answers

What is the type of beam that follows a hyperbolic path?

Hyperbolic beam Signup and view all the answers

What is the purpose of a drybulb thermometer?

To measure temperature Signup and view all the answers

What is the projection that is used to preserve angles and shapes?

Gnomonic projection Signup and view all the answers

What is the stage of the water cycle where water vapor in the air gets cold and condenses?

Condensation Signup and view all the answers

What is the unit of measurement used to describe the accuracy of tide tables?

Tenth of a degree Signup and view all the answers

What is the shape of the crystal formed in a conical, pillar or spar crystal system?

Conical Signup and view all the answers

Study Notes

Determining the Center of Low Pressure

To determine the center of low pressure, consider the wind direction and speed, as well as the movement of the low-pressure system.

Magnetic Properties

The ability of a substance to retain magnetic properties after the magnetizing force has been removed is known as magnetic remanence.

Notice to Mariners is published monthly, bi-monthly, or weekly, depending on the region.
The variation of a compass can be calculated if the true heading and magnetic heading are known.
The shape of the starboard hand lateral mark in IALA Region B is a pillar or spar, cylindrical, or spherical.

Astronomy

21 out of 57 navigational stars tabulated in the Nautical Almanac are of the first magnitude.
Polaris appears due north in the sky with a precision better than 1 degree.

Chart Projections

A chart projection depicting the poles and small areas on either side of a connecting meridian is sometimes used for star charts.
Transverse Mercator projection, Azimuthal Gnomonic projection, Lambert Conformal projection, and Polyconic projection are different types of chart projections.

Water Cycle

Precipitation is the part of the water cycle when clouds get heavy and can no longer hold the liquid water.
Condensation is the part of the water cycle when the water vapor in the air gets cold.

Meteorology

A dry-bulb thermometer is used to measure the temperature of the atmosphere.
Relative humidity is the ratio of the existing water vapor in the air to its saturation value at the same temperature.
An anemometer measures the wind speed and direction.
A psychrometer measures the relative humidity.

Position Fixing

If three position lines intersect in a triangle, the vessel's position can be plotted.
If the lines do not intersect, the vessel's position cannot be determined.

Errors in Position Fixing

Heeling error, pitching error, and local error are types of errors that can occur in position fixing.

Clouds and Weather

A sign of instability which may give rise to bad weather with strong winds is a cumulonimbus cloud.
Rainy weather with strong winds may be preceded by bad weather signs.
A thickness of 2000-4000 feet allows cloud tops to be lower than the freezing level.

Icebergs and Sea Ice

Icebergs and sea ice will move in approximately the same direction and at the same speed.
When operating in an area where sea ice and iceberg are present, a detailed passage plan should be developed.

RADAR and Weather Forecasting

RADAR can be an aid to weather forecasting, especially when weather messages are incomplete or not available.
Showers at close range appear on the screen only if moderate or heavy rain falls.

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Description

Test your knowledge of the Beaufort scale, a system used to measure wind speed, and find out the speed of the wind in a Beaufort force 8. This quiz is perfect for meteorology enthusiasts and those interested in weather forecasting. See how well you can gauge the wind speed!