CRP 1: Meteorology & Oceanography

If there are cumulus clouds in the morning of summer, what kind of cloud cover would you expect and is the reasonable to forecast later in the day?

CUMULONIMBUS CLOUDS

What do you call a gyroscope error that affects the heading system due to the rotation of the Earth?

Apparent Drift

In what area of the Earth surface does the compass decreases its accuracy?

75 Degree Latitude

Which of the following statement is describing a Warm Front?

The Warm air ascend over the colder air is more or less uniform where the intensity of rainfall is wider and longer in duration.

What is your idea of Cold Front?

It is the Line of Discontinuity at the surface or an upper level along which an advancing cold air mass is undercutting a warmer air mass

Describe what is Cold Wall?

It is the sudden Line of Demarcation separating the Gulf Stream from the Labrador Current

Describe the Cold Wave?

It is a period of low temperatures below the average season and locality, which lasts for 24 hours or longer particularly during the cold season.

Which one best describes Gulf Stream?

An ocean current which originates in the Gulf of Mexico and causes warm water to travel up to the East Coast of United States.

Which of the following statements DO NOT describes a Cold Front?

The Warmer air ascends over the colder air is more less uniform where the intensity of rainfall is wider and longer in duration.

How would you categorize the courses and the bearing which are laid down on the chart?

All courses and all the bearing which are laid down on the chart are true.

Base on what you know, would you explain how the Jet Stream affect weather conditions around the world?

The strong wind current of the Jet Stream pushes weather systems around the world.

Which one best describes Jet Stream?

It is a long narrow meandering current of high-speed winds near the tropopause blowing from generally westerly direction and often exceeding a speed of 250 miles.

At 1200H, you fix your position and change course to 315T at 1225H, you again fix your position and it is 0.9 mile southwest of your DR position. Find the drift?

2.1 Knots

Polaris always appears due north in the sky to a precision better than how many degrees?

One Degree

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

Red

What conclusion can you draw if the moon and sun align with the Earth?

The Tides will be stronger because the attraction of the Moon and Sun is combined

Which of the following statement regarding local weather is NOT a considerable importance in the approaches to a harbor and when coasting in tropical waters?

The consideration of fast and quick route while navigating in coastal water and in tropical water.

What is the error introduced into the satellite signal in the ephemeris data?

Epsilon Error

Before a ship is expected to be in sight of a coastline, how would a navigator ensure that the chart for the area is safe for navigation?

The chart for the area have been corrected as to the latest notice to mariners received onboard.

It is the angular distance of a celestial body North or South of the celestial equator measured along the hour circle of the body?

Declination

What is the deviation of a compass if the compass heading is 312 and the magnetic heading is 297?

15 W

Several types of pressure distribution may be associated with radiation fog, which feature all have one in common?

A slack pressure gradients

You determine your vessel's position by taking a range and bearing to a buoy. What is the term you use for your plotted position?

Estimated Position

When should a navigator rely on the position of floating aids to navigation?

Only when fixed aids are not available

How would you compare the precision of the vessel's position during a coastal passage?

It is an accurate position fix taken from conspicuous landmarks

What is the variation of a compass if the True heading is 215 and the Magnetic heading is 210?

5 E

How would you ensure that the vessel's position is correct at all times during coastal navigation?

The bearings by the Magnetic compass must be corrected for variation and deviation

What can you say about sailing directions?

Sailing directions are written directions describing the routes to be taken by ships during coastal navigation.

If your barometer reading shows a high pressure in the area, what kind of weather is expected?

Sunny and Dry

How would you ensure the reliability when transferring a position from Global Positioning System to a nautical chart?

Make sure that the chart and the GPS use the same datum

How would you position your vessel with the wind if in a hurricane's navigable semi-circle in the Northern Hemisphere?

On starboard quarter, hold course and make as much speed as possible.

What kind of magnetism your ship has?

Permanent

Speaking of Global Positioning System, how accurate is a GPS horizontal accuracy?

With a range of 100 meters

Which of the following statement should NOT be included in the reasons why you need a knowledge of Meteorology?

The knowledge of Meteorology will ensure a fast and quick turn around trade route while navigating at sea.

Out of the 57 navigation stars tabulated in the Nautical Almanac, how many are of the first magnitude?

19

If you take a bearing of 264 degree to a lighthouse, what other bearing of another object would give the best fix?

An object with a bearing of about 350 degrees

At 1500H, you fix your position and change course to 315T. At 1525H, you again fix your position, and it is 0.9 miles southwest of your DR position. Find the drift?

2.1 knots

What is the color of the Starboard hand lateral marks in IALA Region A?

Green

What is the use of a wet bulb thermometer?

It measures the temperature of the atmosphere if the atmosphere is 100 percent saturated.

You're on course 330 pgc and 345 psc with a 2E error. If there is a variation of 10W, what is the deviation on this reading?

3 W

How could you determine that mixed (time and clear) icing is most likely to be encountered?

In Nimbostratus cloud at a temperature of 10 degree C

If there were no salt or other hygroscopic particles in the air, would there be any clouds and rain?

The air of the world contains myriads of hygroscopic particles without it there will be neither clouds nor rain.

What meteorological conditions are likely to produce sub-refraction?

Very cold air blowing over a relatively warm sea

In weather forecasting, what is the meaning of the expression NSW?

The forecast indicates the end of the significant weather.

What would be the nature of the bottom if you see fine dots on some of the coastal areas of a chart?

Sandy Beach

What is the function of radar that is used to determine the relative distance of any target on the screen to accurately determine position?

Variable Range Marker

Atmospheric pressure indicated by a barometer or a barograph may be subjected to several errors. Which of the following is NOT an error affecting barometer reading?

Speed Error

Your ship is on course 150 at a speed of 17 knots, if the apparent wind is from 040 of the starboard bows at a speed of 15 knots. What would be the direction of true wind and speed?

True wind from 270 and speed about 11 knots

Your ship is on course 180 at a speed of 22 knots, if the apparent wind is from 070 of the starboard bows at a speed of 20 knots. What would be the direction of true wind and speed?

True wind from 231 and speed about 24 knots

Which of the following statement describes on how does the corona of the sun and moon is formed?

When the sun or moon is seen through altostratus clouds its outline is indistinct, and it appears surrounded by a glow of light.

What is your understanding of an aid to navigation?

Any device external to a vessel specifically intended to assist navigators in determining their position.

In Great Britain, the Nautical Almanac has been published annually and each page contains data that are tabulated for how many days?

3 Days

Determine the relative humidity if the air temp is 90F and the wet bulb temp is 81F.

67%

What is the deviation of a compass if the Compass heading is 312 and the Magnetic heading is 298?

14 W

Which of the following terms refer to the direction of the flow of the current?

Set

How are air masses and ocean currents connected to each other?

Warm air masses warm ocean currents

How can it help you avoid the center of the storm using your radar?

The radar can display on the screen areas moderate or heavy rain continuously for at least 50 nautical miles in broad sector.

What is the light color of the Port hand lateral marks used in IALA Region B?

Green

What is the main idea of correcting the compass bearings of landmarks used for navigation?

If corrected, these two bearing lines should intersect and you are more or less at the point where they intersect.

A hurricane has recurved to the NE with a forward speed of 20 knots. Your ship with a forward speed of 20 knots. Your ship is located 600 miles NE of the hurricane's center. How long will it take for the hurricane's center to reach your position if it holds its present course and speed?

30 hours

What does a GPS receiver measure?

The time between transmission and reception of a signal from a satellite.

What is the effect of an uncorrected deviation due to permanent magnetism when a ship is proceeding towards the magnetic equator?

Decreases

Where will you find the correction to apply to your barometer reading in order to allow for the effect of diurnal variation?

The amount of which is given each hour of the day in the customary climactic atlases.

How would you find the azimuth of an object in coastal navigation?

Shoot the bearing of a conspicuous object

How would you determine the aneroid barometer's approximate height correction?

The height in feet above sea level increased by 10 percent and divided by 30 gives correction in hectopascals to be added.

You are plotting a fix. The line of position to be run forward is an arc from the radar range, What technique can you use?

The position of the object observed should be advanced to the new time and a new arc swung using the radius of the old arc.

What is the meaning of the coded form M02/M05 in the weather report for LOWL at 070650Z?

The actual temperature is -2 degree and the dew point temperature is -5 degree Celsius.

When the navigational channel passes under a fixed bridge, what would be the lights that mark the edges of the channel on the bridge?

Red Lights

Which of the following is TRUE about the height of the tide?

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

What color of light will be displayed when information markers are lighted?

White lights

Which routing measure is described that constitute a boundary of opposing streams of traffic by appropriate means?

TSS

How would you define alternating light?

A rhythmic lights showing light of alternating colors.

What is the deviation of a compass if the compass heading is 213 and the magnetic heading is 221?

8 E

How could you determine the circumstances where there is a clear sky, calm wind and a high relative humidity in Autumn?

Radiation fog is likely at sunrise after previous mist

What is the variation of a compass if the True bearing is 215 and Magnetic heading is 223?

8 W

What would be the approximate geographical visibility of an object with a height of 10.7 meters above sea level for an observer at a height of 21.7 meters?

16.7 nm

What is the light color of the NORTH Cardinal Marks used in IALA Region A & B?

White

There are two separate carrier frequencies that carry the signal transmitted by the GPS satellite. What is the first carrier frequency?

1575.42 MHz

There are two separate carrier frequencies that carry the signal transmitted by the GPS satellite. What is the secondary carrier frequency?

1227.60 MHz

Which of the following occurring phenomena can change the polarity of the magnetic properties of a vessel?

Being struck by lightning

In what way can a RADAR help you to avoid the storm center?

Certain RADAR sets can display on the screen areas moderate or heavy rain continuously for at least 50 nm in broad sector.

What approach would you use in keeping up-to-date Sailing Directions?

I will ascertain if the book under consideration is the last one issued for the area covered.

If you take a bearing of 043 and 169 to two prominent objects, what bearing of the third object will provide the best fix?

The best bearing of the third object should be about 102 degrees.

What is the topmark of the STBD hand lateral marks used in IALA Region A?

Single Green Cone, point upward

What idea justify that wet bulb temperature would normally be lower than the dry bulb temperature?

Evaporation causes Cooling

What is the variation of a compass if the True heading is 312 and the Magnetic heading is 298?

14 E

In navigation, what is meant by a buoy?

A floating object which is anchored at a given position of defined shape and color and serves as an aid to navigation.

You are running parallel to the coast and plotting running fixes using bearings of the same landmark. For the running fix, you are making more speed than you have assumed. What would be your position in relation to the coast?

You are farther from the coast.

How could you determine the existence of the conditions that allow thunderstorms to be developed?

A plentiful supply of moisture and steep lapse rate through a large vertical extent and a trigger action.

What is the light color of the Port hand lateral marks used in IALA Region A?

Red

What celestial body may sometimes be observed in daylight?

Venus

When will a celestial body will cross the prime vertical circle?

When the latitude is numerically greater than the declination and both are of the same name.

Polar distances are expressed in degrees and is not affected by the precession of the equinoxes. What is the polar distance of an object that is on the celestial equator?

90 Degrees

How would you determine the existence of the condition that poor visibility is developing?

When warm air passes over a surface which is cooler than dew point of the air. Advection fog can form. This occurs over land and sea.

Determine the relative humidity if the air temperature is 70F and wet bulb temperature is 60F.

57%

Which of the following statements best describes the term tide?

Regular vertical movement of the sea level in oceans.

You are onboard a right-handed single screw vessel proceeding along the right bank of a narrow channel, what should you do if the vessel starts to steer due to bank suction/cushion effect?

Increase speed and put the rudder right full.

In weather forecasting, certain type of cloud is associated with certain type of weather. If you observed with an "ALTOCUMULUS" type of cloud at a sufficient low angle of elevation, what does it represent?

A sign of instability which may give rise to thunderstorms.

What would you conclude if you saw nimbostratus clouds develop in the close area of your ship at sea?

There will be rain and visibility will deteriorate.

How would you ensure the operational readiness of the steering system in case of emergency?

Simple operating instruction of the steering system should be displayed in the wheel house.