Competence 1 (Deck)

40 Questions | By Catherinehalcomb | Updated: Mar 21, 2022 | Attempts: 3622

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1.

Where can the data relating to the direction and velocity of rotary tidal currents be found?
- A.
  
  Tidal Current Tables
- B.
  
  Mariner's Guide
- C.
  
  Tide Tables
- D.
  
  Nautical Almanac
2.

What is the nature of the beam transmitted by echo sounder?
- A.
  
  Parabolic
- B.
  
  Directional
- C.
  
  Hyperbolic
- D.
  
  Linear
3.

Which statement about the Flinders bar on a magnetic compass is correct?
- A.
  
  It corrects the semi-quadrantal error at intercardinal headings.
- B.
  
  It compensates for the error caused by the vertical component of the earth's magnetic field.
- C.
  
  It allows the magnetic compass to move freely in the fluid.
- D.
  
  It reduces the deviation into half.
4.

What is a chart that covers a large area?
- A.
  
  Large scale chart
- B.
  
  General chart
- C.
  
  Coastal chart
- D.
  
  Small scale chart
5.

Which chart symbol indicates that the bottom is coral?
- A.
  
  Sh
- B.
  
  Cl
- C.
  
  Co
- D.
  
  R
6.

When navigating using DGPS, you may expect your position to be accurate to within a radius of ________ meters.
- A.
  
  100 m
- B.
  
  50 m
- C.
  
  20 m
- D.
  
  10 m
7.

The standard atmospheric pressure in millimeters of mercury is:
- A.
  
  960
- B.
  
  760
- C.
  
  23.25
- D.
  
  29.92
8.

The interval between the sun's upper limb being in the horizon and its center being 12 degrees below is called:
- A.
  
  Astronomical twilight
- B.
  
  Civil twilight
- C.
  
  Nautical twilight
- D.
  
  Observational twilight
9.

In the IALA Buoyage System, what is the color of an East Cardinal Mark?
- A.
  
  Black band with above and below yellow band
- B.
  
  Black band above and below yellow band
- C.
  
  Black band below yellow band
- D.
  
  Black band above yellow band
10.

Which statement is TRUE concerning "night effect" and the reception of radio signals?
- A.
  
  "Night effect" is most prevalent late at night
- B.
  
  During "night effect", polarization is at a minimum
- C.
  
  "Night effect" is caused by all of the polarized ground waves being vertical
- D.
  
  "Night effect" is caused by rapid changes in the ionosphere
11.

The standard time meridian for zone description -1 is:
- A.
  
  15deg. E
- B.
  
  7 1/2deg. E
- C.
  
  0deg.
- D.
  
  7 1/2deg. W
12.

Polaris is always within how many degrees of the north pole?
- A.
  
  1 degree
- B.
  
  0.2 degree
- C.
  
  0.5 degree
- D.
  
  0.1 degree
13.

The mean distance between the earth and the sun is:
- A.
  
  1 astronomical unit (AU)
- B.
  
  1 celestial unit
- C.
  
  1 parsec
- D.
  
  4.3 light years
14.

A general chart could have a scale of:
- A.
  
  1. 50,000
- B.
  
  Not more than 1. 25,000
- C.
  
  1. 200,000
- D.
  
  1. 1,000,000
15.

The standard sea level pressure of the atmosphere is:
- A.
  
  1013.25 millibars of mercury
- B.
  
  1012.45 millibars of mercury
- C.
  
  1013.52 millibars of mercury
- D.
  
  1012.35 millibars of mercury
16.

A vessel is following a range to keep herself if within a narrow channel. The chart indicates the range to be 243deg. The vessel is on range, when she is steering a course of:
- A.
  
  234deg. T
- B.
  
  063deg. T
- C.
  
  270deg. T
- D.
  
  243deg. T
17.

Due to the revolution of the earth around the sun, a sidereal day is shorter than a solar day by about:
- A.
  
  3 mins and 26 secs
- B.
  
  3 mins and 36 secs
- C.
  
  3 mins and 06 secs
- D.
  
  3 mins and 56 secs
18.

The apparent wind can be zero when the true wind is from:
- A.
  
  Astern and equal to the ship's speed
- B.
  
  Ahead and equal to the ship's speed
- C.
  
  Ahead and equal to twice the ship's speed
- D.
  
  Astern and equal to twice the ship's speed
19.

If your vessel is dragging her anchor in a strong wind, you should:
- A.
  
  Increase the scope of anchor cable
- B.
  
  Shorten the scope of anchor cable
- C.
  
  Put over a stern anchor
- D.
  
  Dropped another anchor
20.

From those listed, which would be the preferred method of position fixing for greatest accuracy and certainty of position?
- A.
  
  Taking a radar range and radar bearing
- B.
  
  Taking several radar bearings
- C.
  
  Taking several radar ranges
- D.
  
  Taking a radar range and visual bearing
21.

What is the position obtained by applying only your vessel's course and speed to a known position?
- A.
  
  Dead-reckoning
- B.
  
  Probable position
- C.
  
  Applied position
- D.
  
  Fix
22.

A barometric pressure reading of 29.92 inches of mercury is equivalent to __________.
- A.
  
  1010.35 millibars
- B.
  
  1012.35 millibars
- C.
  
  1013.25 millibars
- D.
  
  1015.25 millibars
23.

Apparent altitude is sextant altitude corrected for _____________.
- A.
  
  Difference is assumed latitude and actual latitude
- B.
  
  Inaccuracies in the reading and reference level
- C.
  
  Double-second difference
- D.
  
  Chronometer error and dip
24.

Where can the data relating to the direction and velocity of rotary tidal currents be found?
- A.
  
  Nautical Almanac
- B.
  
  Mariner's Guide
- C.
  
  Tide Tables
- D.
  
  Tidal Current Tables
25.

What is the speed of sound in the water?
- A.
  
  1.5 kilometers per second
- B.
  
  1.3 kilometers per second
- C.
  
  0.8 kilometer per second
- D.
  
  1.1 kilometers per second

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Competence 1 (Deck)

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