OIC-NW MARINA REVIEWER / QUIZ COMPETENCE 1 - PART 1 - Seaman Kowts

COMPETENCE 1 – Plan and Conduct a Passage and Determine Position

Results

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#1. The length of the year with respect to the vernal equinox is the:

tropical year

sidereal year

anomalistic year

All of the above

Incorrect!

#2. The most accurate method of determining gyrocompass error while underway is by:

comparing the gyro azimuth of a celestial body with the computed azimuth of the body

comparing the gyro heading with the magnetic compass heading

determining from the chart the course made good between celestial fixes

It cannot be determined accurately at sea due to drift of unknown currents.

Incorrect!

#3. Where do you find the semidiameter correction to be used to correct sextant observations of the stars?

It is included in the altitude corrections inside the front cover of the Nautical Almanac

Table 25 in Bowditch contains the correction

A correction of -0.5' should be applied to all star sights

No semidiameter correction is used

Incorrect!

#4. An instrument which maintains a continuous record of temperature changes is called a:

thermograph

thermometer

barometer

hygrograph

Incorrect!

#5. The diurnal variation of pressure is most noticeable:

above the polar circles

in a low pressure area

during periods of low temperatures

in the doldrums

Incorrect!

#6. Under ideal viewing conditions, the dimmest star that can be seen with the unaided eye is of what magnitude?

First

Third

Fourth

Sixth

Incorrect!

#7. The "horse latitudes" are regions of:

brisk prevailing winds

light airs and calms

abundant blue sea grass vegetation

None of the above

Incorrect!

#8. At the magnetic equator there is no induced magnetism in the vertical soft iron because:

the lines of force cross the equator on a 0°-180° alignment

the quadrantal error is 0°

there is no vertical component of the Earth's magnetic field

the intercardinal headings have less than 1° error

Incorrect!

#9. A warm air mass is characterized by:

stability

instability

gusty winds

good visibility

Incorrect!

#10. If a magnetic compass is not affected by any magnetic field other than the Earth's, which statement is TRUE?

Compass error and variation are equal

Compass north will be true north

Variation will equal deviation

There will be no compass error

Incorrect!

#11. The pressure gradient between the horse latitudes and doldrums runs:

east to west

north to south

northeast to southwest

northwest to southeast

Incorrect!

#12. Your chart indicates that there is an isolated rock and names the rock using vertical letters. This indicates the:

rock is visible at low water springs only

rock is a hazard to deep draft vessels only

rock is dry at high water

exact position of the rock is doubtful

Incorrect!

#13. Lines drawn through points on the Earth having the same atmospheric pressure are known as:

isothermal

millibars

isobars

seismics

Incorrect!

#14. Complete information on weather broadcasts throughout the world is contained in:

Selected Worldwide Marine Weather Broadcasts

your local newspaper

the Notice to Mariners

the daily weather map

Incorrect!

#15. The LMT of sunrise on the standard meridian is 0552. Your longitude is 99deg. 15'E. What is your ZT of sunrise?

0512

0529

0552

0615

Incorrect!

#16. What is the equivalent of 5deg. 54' in time units?

20 min. 16 sec.

23 min. 36 sec.

25 min. 54 sec.

30 min. 27 sec.

Incorrect!

#17. The Daily Memorandum contains information on:

active weather disturbances such as hurricanes or tropical storms

the latest navigational warnings

scheduled vessel arrivals and departures for a 24- hour period

water levels at river ports where run-off affects tidal heights

Incorrect!

#18. On a working copy of a weather map, a stationary front is represented by which color line?

Red

Blue

Alternating red and blue

Purple

Incorrect!

#19. Which statement concerning GPS is TRUE?

It cannot be used in all parts of the world.

There are 12 functioning GPS satellites at present.

It may be suspended without warning.

Two position lines are used to give a 2D fix.

Incorrect!

#20. The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean:

lower low water

low water

tide level

high water

Incorrect!

#21. A cold front moving in from the northwest can produce:

thunderstorms, hail, and then rapid clearing

increasing cloud cover lasting for several days

lengthy wet weather

low ceilings with thick cirrus clouds

Incorrect!

#22. A pilot chart does NOT contain information about:

average wind conditions

tidal currents

magnetic variation

average limits of field ice

Incorrect!

#23. Radiation fog:

always forms over water

is formed by a temperature inversion

is thinnest at the surface

dissipates during the evening

Incorrect!

#24. A hurricane moving northeast out of the Gulf passes west of your position. You could expect all of the following EXCEPT:

higher than normal swells

high winds

winds veering from south, through west, to northwest

gradual pressure gradient

Incorrect!

#25. A vessel heading NNW is on a course of:

274.5°

292.0°

315.5°

337.5°

Incorrect!

#26. You are in LONG 144deg. E. The date is 6 February, and the zone time is 0800. The Greenwich date and time are:

2200, 5 February

2300, 5 February

1700, 6 February

1800, 6 February

Incorrect!

#27. What current flows southward along the west coast of the United States and causes extensive fog in that area?

Davidson Current

North Pacific Current

Alaska Current

California Current

Incorrect!

#28. The fog most commonly encountered at sea is called:

conduction fog

radiation fog

frontal fog

advection fog

Incorrect!

#29. The spin axis of a gyroscope tends to remain fixed in space in the direction in which it is started. How does this gyroscope become north seeking so that it can be used as a compass?

By mechanically or electrically applying forces to precess the gyroscope

By starting the compass with the spin axis in a north/south position

By taking advantage of the property of gyroscopic inertia

The rotation of the Earth (Earth rate) automatically aligns the gyroscope with north, except for speed

Incorrect!

#30. When a low pressure area is approaching, the weather generally:

improves

worsens

remains the same

is unpredictable

Incorrect!

#31. Between the equator and the 46th parallel of latitude, there are 3099 meridional parts. How many degrees of equatorial longitude does 3099 meridional parts represent?

35°52'45"

51°39'00"

74°21'11"

82°36'12"

Incorrect!

#32. A sextant having an index error that is "off the arc" has a:

positive correction

dip error

negative correction

semidiameter error

Incorrect!

#33. A system of reservoirs and connecting tubes in a gyro compass is called a:

spider element

gyrotron

mercury ballistic

rotor

Incorrect!

#34. In the celestial equator system of coordinates what is the equivalent to the meridians of the Earth system of coordinates?

Horizon

Hour circles

Vertical circles

Parallel of declination

Incorrect!

#35. The velocity of a rotary tidal current will be decreased when the Moon is:

at apogee

new

full

All of the above

Incorrect!

Finish

There are 35 questions for the actual examination for Competence 1 for OIC-NW with a passing rate of 70%. This means that you are only allowed to make 10 mistakes.

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Results

#1. The length of the year with respect to the vernal equinox is the:

#2. The most accurate method of determining gyrocompass error while underway is by:

#3. Where do you find the semidiameter correction to be used to correct sextant observations of the stars?

#4. An instrument which maintains a continuous record of temperature changes is called a:

#5. The diurnal variation of pressure is most noticeable:

#6. Under ideal viewing conditions, the dimmest star that can be seen with the unaided eye is of what magnitude?

#7. The "horse latitudes" are regions of:

#8. At the magnetic equator there is no induced magnetism in the vertical soft iron because:

#9. A warm air mass is characterized by:

#10. If a magnetic compass is not affected by any magnetic field other than the Earth's, which statement is TRUE?

#11. The pressure gradient between the horse latitudes and doldrums runs:

#12. Your chart indicates that there is an isolated rock and names the rock using vertical letters. This indicates the:

#13. Lines drawn through points on the Earth having the same atmospheric pressure are known as:

#14. Complete information on weather broadcasts throughout the world is contained in:

#15. The LMT of sunrise on the standard meridian is 0552. Your longitude is 99deg. 15'E. What is your ZT of sunrise?

#16. What is the equivalent of 5deg. 54' in time units?

#17. The Daily Memorandum contains information on:

#18. On a working copy of a weather map, a stationary front is represented by which color line?

#19. Which statement concerning GPS is TRUE?

#20. The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean:

#21. A cold front moving in from the northwest can produce:

#22. A pilot chart does NOT contain information about:

#23. Radiation fog:

#24. A hurricane moving northeast out of the Gulf passes west of your position. You could expect all of the following EXCEPT:

#25. A vessel heading NNW is on a course of:

#26. You are in LONG 144deg. E. The date is 6 February, and the zone time is 0800. The Greenwich date and time are:

#27. What current flows southward along the west coast of the United States and causes extensive fog in that area?

#28. The fog most commonly encountered at sea is called:

#29. The spin axis of a gyroscope tends to remain fixed in space in the direction in which it is started. How does this gyroscope become north seeking so that it can be used as a compass?

#30. When a low pressure area is approaching, the weather generally:

#31. Between the equator and the 46th parallel of latitude, there are 3099 meridional parts. How many degrees of equatorial longitude does 3099 meridional parts represent?

#32. A sextant having an index error that is "off the arc" has a:

#33. A system of reservoirs and connecting tubes in a gyro compass is called a:

#34. In the celestial equator system of coordinates what is the equivalent to the meridians of the Earth system of coordinates?

#35. The velocity of a rotary tidal current will be decreased when the Moon is:

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