Competence 1 - Plan and Conduct Passage Plan and Determine Position
Joshua Eric Abe
問題数 564 • 2/11/2025
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1
You are in route from Puerto Rico to New York. A hurricane makes up and is approaching. What will be the indication if the wind is veering steadily?
your vessel is in the dangerous semicircle
2
What is the maximum sustained surface wind speed of a cyclone in order to be classified as a tropical depression?
about 33 knots
3
In navigation, what is meant by articulated beacon?
a buoyant structure, theater directly to the sea bed and having no watch circle
4
What will be the reading that is equivalent to one complete turn of the graduated scale micrometer drum of a sextant?
1 degree
5
How do echo sounder deliver an accurate reading?
performance of a sonar system depends on the accuracy with which the velocity of source propagation is measured
6
How do you expect of your position to be 95% accurate when navigating using GPS?
within radius of 100 m
7
Referring to the light list, a light has a nominal range of 14 miles and 26 ft high. If the visibility is 4 nautical miles and your height of eye is 20.0 feet, at what approximate distance will you sight the light?
7.5 nautical miles
8
What does a sling psychometer measure?
relative humidity
9
What can you say about sailing directions?
sailing directions are written directions describing the routes to be taken by ships during coastal navigation
10
What is meant by speed made good?
this is the net speed based on the distance and time of passage directly from one point to another
11
How would you show your understanding on the term compass points?
it is the division of a compass at equal intervals in degrees and each division is farther divided quarterly
12
What is the difference between the true north and magnetic north?
variation
13
What is meant by acronym VDR?
voyage data recorder
14
What is the unit of magnetic induction?
gauss
15
What position do you obtain when you take two or more intersecting position lines at nearly the same time?
fix
16
What do you think will happen to the speed of sound, when the water salinity increases?
it will increase
17
What features of a day mark is (are) used to identify the beacon upon which is mounted?
color and shape
18
What is the latitude of a place where the sun is exactly at the senate of the observer of local apparent noon (LAN) of June 21?
23 deg. 27 min. North
19
How does a global positioning system receiver get a signal from the satellite?
satellite signals are sent at different frequencies and coded
20
What is the effect of uncorrected deviation due to permanent magnetism when a ship is proceeding towards the magnetic equator?
decreases
21
If your barometer reading shows a high pressure in the area, what kind of weather is expected?
sunny and dry
22
You are approaching port and encountered a white buoy marked with an orange rectangle. What would it indicates?
general information
23
What is your understanding of compass heading
it is the heading relative to compass north wherein the vessel is being navigated
24
Your vessels heading is 330° pgc and 345° psc with a 2° E gyro error. If there is a variation of 13°W, what is the deviation on on this heading
0°
25
What will be the effect of the uncorrected deviation due to permanent magnetism if the shape is proceeding towards the magnetic equator?
decreases
26
What is safest and most prudent procedure to follow while navigating in the vicinity of a tropical cyclone?
take a possible steps to avoid it if possible
27
You are on course 355°T end take a relative bearing of the peak of a mountain of 275°. What is the true bearing of the peak of the mountain?
270°T
28
It is an instrument designed to maintain a continuous record of atmospheric pressure?
barograph
29
Which is your best indicator of change in weather that may be expected at the passage of a line squall?
a sudden rise in barometric pressure
30
If you are in the northern hemisphere as a general rule ( Buys Ballot's Law), how could you determine the center of the pressure?
faces the surface of the wind the center of low is toward your right
31
Consider a place approaching a channel when the height of HW is 3.8 meters.The vessels draught is 2.5 meters. What is the under keel clearance Over a rock of drying height 0.9 meters?
under keel clearance = 0.4 m at high water
32
What is precipitation?
the part of the water cycle when clouds get heavy and can no longer hold the liquid water
33
What is the color of the PORT hand lateral marks in IALA region A?
Red
34
When the body is on the rational horizon, what is it zenith distance?
090 degrees
35
What do you call the function of the horizontal component of the compass that gives the compass needle the ability to point north?
directive force
36
How did the vessel acquired her permanent magnetism?
due to energy imparted when cutting and welding
37
What would result if the moon and sun align with the earth?
tides are stronger
38
Which of the following is the tourist sign of proximity of a tropical storm?
if the interruption on the barometer is 5 mb or more below normal
39
What is your idea about a cold front?
it is when a colder air is under running and displacing warmer air
40
Which of the following is INCORRECT about differential GPS?
it reduces geometric dilution of position
41
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
42
How would you characterize the tropopause in mid-latitude
lower in winter with a higher temperature
43
What is meant by FIX by navigation?
it is a vessel position at time of observation
44
How would you show your understanding of relative humidity?
it is the ratio of the existing absolute humidity to each saturation value at the same temperature
45
How would you estimate the bearing of the storm centers in the northern hemisphere?
By Buys Ballot's Law if you face the wind of the center of the storm is approximately in your right
46
How would you classify the sextant error when the index arm is not pivoted at the exact center of the arc?
centering error
47
How would you define alternating light?
a rhythmic light showing light of alternating colors
48
Which one best describes jet stream
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 per hour
49
Which routeing measure is described that constitute of boundary of opposing streams of traffic appropriate means?
traffic separation scheme
50
How would you classify the circular line limiting the observer view at sea?
it is the visible horizon
51
What is the nature of the beam transmitted by echo sounder?
it is a directional beam
52
How would you classify the position that is obtained by applying charted current and observed wind direction to your vessels course and speed?
estimated position
53
What corrections must always be applied, when reading a mercurial barometer?
Corrections for latitude and height above sea level
54
You are underway and intend to make a good course of 040°T. You experience a current with a set and drift of 190°T at 1.4 knots and a northwest wind produces a leeway of 3°. You adjust your course to compensate for the current and leeway, while maintaining an engine speed of 10.0 knots. What will be your speed made good over your intended course of 040°T?
8.8 knots
55
What is the relationship of the GAIN switch in the overall performance of the echo sounder in order to obtain accuracy and a clear record of the seabed?
it entails signal application of the noise and consequently the data record may be confused.
56
Atmospheric pressure indicated by a barometer may be subjected to several errors. Which of the following is NOT an error affecting barometer reading?
speed error
57
Which of the following apply to the angular height of the center of a body above the observer rational horizon?
true altitude
58
On an echo sounder, which of these is used to draw a line on the paper to mark a specific time of an occurrence?
event marker
59
What is meant by acronym RML?
relative motion line
60
What would you show your understanding of an echo sounders having a multipath errors?
the echo may be reflected a number of times between the keel and the seabed, thereby giving multiple depth marks on the record depth
61
Where would you find a comprehensive list of navigating charts with the title and number of various parts of the world?
chart catalogue
62
What is the color of the starboard hand lateral marks in IALA region A?
Green
63
What is your idea of a cold front
it is the line of the discontinuity at the surface or a upper level along which an advancing cold air mass is undercutting a warmer air mass
64
If you wish to know the general information on in root weather and climate, in which of the following publications you will refer to?
the sailing direction and coast pilot
65
Determine the relative humidity if the air temperature is 90° F and the wet bulb temperature is 81°F?
67%
66
What instrument fitted with the prism is set on a compass repeater for observing the bearing of the sun?
azimuth circle
67
In modern fathometers how does the sonic or ultrasonic sound waves are produced electrically?
it is produced by means of a transducer
68
How does the jet stream affect weather conditions around the world?
the strong wind current of the jet streams pushes weather systems around the world
69
Common time of on a typical clock measures a slightly longer cycle accounting for the earth's axial rotation. How much is the difference between a sidereal day and a solar day?
4.0905 SI seconds
70
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
71
What is the meaning of the coded form MO2/MO5 in the weather report for LOWL at 070650Z?
the actual temperature is -2° and the dew point temperature is -5°C
72
Which of the following statement is describing a warm front?
the warmer air ascend over the colder air is more or less uniform where the intensity of rainfall is wider and longer in duration
73
There are two separate carrier frequencies that carry the signal transmitted by the GPS satellite. What is the second carrier frequency?
1227.60 MHz
74
How would you plan your course if it is crossing a TSS?
plan a course that is perpendicularly or as near as perpendicular
75
How does the air move in sea breeze?
wind moves from ocean to land
76
You are navigating in the open sea when you receive the following navigational warnings. How would you classify navigational warnings in order of importance?
gale warnings; any changes or development of new buoyage system. vessels aground in approaching port areas; gaunnery or fire exercise areas and underwater activities in certain areas
77
What frequency does automatic identification system (AIS) transponder transmit and receive messages?
VHF maritime band
78
What is the deviation of a compass if the compass heading is 312° and the magnetic heading is 297°?
15°W
79
The dry bulb thermometer is 30° c and the wet bulb temperature is 28°C, what is the relative humidity
85%
80
In a paper chart correction, which of the following navigational aids should NOT be marked with a magenta circle?
aero radio beacon
81
What is the space formed between the direction of the earth's magnetic field and the horizontal?
magnetic dip
82
At 1500H, you fix your position and change course to 315°T, at 1525H, you again fix your position, and it is 0.9 mile southwest of your DR position. Find the drift.
2.1 knots
83
What do you think is one of the most applicable method in connection with the keeping up to date sailing directions by navigators?
to know incidentally if the book will be the subject of revision within a short time
84
What is the relationship of the pulse length, in the overall performance of the echo sounder in order to obtain accuracy in a clear record of the seabed?
it is responsible for the vertical resolution of the echo sounder, short pulses are necessary for a better resolution to reduce the probability of false echoes due to strong reverbation
85
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 receive on board
86
The intersection of spheres of position are required to obtain a fix from GPS. How many sphere of position lines is required to obtain an accurate position from GPS?
it required four sphere of position lines
87
Referring to the light list, a light has a nominal range of 14 miles and 26 ft high. If the visibility is 14 nautical miles and your height of eye is 20.0 ft, at what approximate distance will you sight the light?
11.1 nautical miles
88
How would you classify navigational warnings in order of importance?
casualties to large navigational buoys, primary lights or light ships; dangerous wrecks or obstruction to navigation; changes in depth of water; floating dangers-like containers, drifting buoys, icebergs
89
What is the ability of a substance to retain magnetic properties after the magnetizing forces been removed?
magnetic remanence
90
Which routeing measure is described as areas within defined limits that constitute a boundary caused by natural obstacles, including those forming separation zone?
traffic lane
91
When using the depth finder in the open ocean, what phenomena is most likely provide a continuous trace that isn't from the actual bottom?
it generate echoes from depth scattering layer
92
Which of the following statements regarding differential GPS is FALSE?
it reduces geometric dilution of position
93
Navigation, how would you define a characteristic?
it is the audible, visual, or electronic signal displayed by an eight to navigation to assist in the identification
94
How can it help you to avoid the center of the storm using radar?
the radar can display on the screen areas moderate or heavy rain continuously for at least 50 nautical miles in broad sector
95
It is the angular distance of a celestial body north or south of the celestial equator measured along the hour circle of the body
declanation
96
How could you call a chart that has extensive corrections made and again printed?
new edition
97
Which global positioning system signal or code is available for use by civilians?
the SPS signal
98
Why should buoys be avoided in fixing the ship's position?
buoys position can be relocated hence and reliable
99
What is the light color ( when fitted) of the port hand lateral marks used in IALA region B?
Green
100
When you are in polar region, which of the following weather condition is NOT expected?
to experience extensive snowfall