記憶度
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1
301. What is the light color (when fitted) of the SOUTH cardinal marks used in IALA Region A and Region B?
•White
2
302. What is your idea of a Cold Sector?
•It is that area of a depression occupied by cold air at the surface and comprises the whole depression after the occluding process has been completed.
3
303. What do you call the phenomenon that will happen when magnetization of an iron or steel lags behind the field?
•Hyteresis
4
304. What can you say about Sailing Directions?
•Sailing Directions are written directions describing the routes to be taken by ships during coastal navigation.
5
305. When a new chart is received onboard , how woulld you correct a new chart?
•Highlight the chart in the correction log; Enter the chart folio and sequence number; Correct the chart for any pending corrections; Correct the Admiralty Chart catalogueif affected; Correct the old edition of the chart.
6
306. You determine your vessel's position by taking a range and bearing to a buoy. What is the term you used for your plotted position?
•Estimated position
7
307. What would result if the moon and sun align with the Earth?
•Tides are stronger
8
308. What do you call the altitude measured with sextant corrected for dip and index error?
•Apparent altitude
9
309. What is the speed of the sun as it moves towards the star Vega?
•12 miles per second
10
310. How would you find the azimuth of an object in coastal navigation?
•Shoot the bearing of a conspicuous object.
11
311. In which publication can you find the height of tides of a given place?
•Admiralty Tide Tables.
12
312. What is the ratio of the intensity of magnetization produced in a substance to the magnetic force to which the material is subjected?
•Magnetic susceptibility.
13
313. You are proceeding down a channel at night. It is marked by a range light which bears 185T. You steady up on a compass course of 180T with the range light in line dead ahead. What does this kind of situation indicate?
•Your compass has some easterly error.
14
314. How would you position your vessel with the wind if in a hurricane's navigable semicircle in the northern hemisphere?
•On starboard quarter, hold course and make as much speed as possible
15
315. What do you call a chart that is used generally for a long ocean passage?
•Small scale chart
16
316. What is meant by arc of visibility?
•It is the portion of the horizon over which a lighted aid to navigation is visible from seaward.
17
317. Using the radar your own ship is shown as the center of the screen and 0 degrees always appear at the top of the screen. How would you define the bearing obtain?
•Relative bearing
18
318. Which routeing measure is described that constitute a boundary of opposing streams of traffic by appropriate means?
•Traffic separation scheme.
19
319. 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 onboard.
20
320. What is the variation of a compass if the True heading is 086° and the Magnetic heading is 098°?
•12°W
21
321. Which of these situations may cause false echoes in an echo sounder?
•Turbulence from the interaction of tidal streams with solid particles in suspension.
22
322. When the gyro-pilot is used for steering how would you adjust to compensate for varying sea conditions?
•Adjust the weather adjustment.
23
323. How would you organize in keeping up-to-date Sailing Directions?
•I will ascertain if the book under consideration is the last one issued for the area covered
24
324. 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.
25
325. What would you call the number of lines of force crossing a given surface area in magnetic field?
•Magnetic flux.
26
326. In weather forecasting, certain types of clouds are associated with certain types of weather. If you observe with a "mackerel sky", what is the belief does it represents?
•Precursor of bad weather
27
327. What is the unit of magnetic induction?
•Gauss.
28
328. How many semi-diurnal tides occur in a 24 hours and 53 minutes cycle?
•2
29
329. What could cause the change of polarity of the vessel's magnetic properties?
•Being struct by lightning
30
330. If there were no salt or other hygroscopic partricles 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.
31
331. You are on an ice-reinforce vessel about to enter pack ice. What should you do?
•You should look for areas of rooten ice and enter pependicular to the ice edge
32
332. How would you prove your understanding of Relative Humidity?
•The actual amount of water vapor in a sample of air over the maximum amount of water vapor that the sample can contain x 100.
33
333. What is meant by acronym VDR?
•Voyage Data Recorder.
34
334. 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
35
335. How would you calculate the approximate height correction of aneroid barometer?
•The height in feet above sea level increased by 10 percent and divided by 30 gives correction hectopascals and to be added.
36
336. What minimum thickness of cloud layer is indicated if precipitation is reported as light or greater intensity?
•4000 feet thick.
37
337. 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.
38
338. What is the used of a wet bulb thermometer?
•It measures the temperature of the atmosphere if the atmosphere is 100 percent saturated.
39
339. What phenomenom occurs of which can change the polarity of the magnetic properties of a vessel?
•being struct by lightning
40
340. Where can the maximum hazard zone caused by wind shear associated with a thunderstorm be located?
•On all sides and directly under the thunderstorm cell.
41
341. In modern fathometers how does the sonic or ultrasonic sound waves are produced electrically?
•It is produce by means of a transducer
42
342. 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
43
343. What would you show your understanding of an echo sounder having a Multipath Echoes error?
•The echo may be reflected a number of times between the keel and the seabed, thereby giving multiple depth marks on the record depth.
44
344. Why should buoys be avoided in fixing the ship's position?
•Buoys position can be relocated hence unreliable.
45
345. Describe what is a COLD WAVE?
•It is a period of low temperatures below the average season and locality, which last for 24 hours or longer particularly during and cold season.
46
346. Which of the following is an indication of change in the weather that may be expected on the passage of a line squal?
•Sudden rise on the barometric pressure
47
347. How is a buoy marking a wreck be identified?
•With white light F(2) and a topmark of 2 black spheres.
48
348. What is the light color (when fitted) of the NORTH cardinal marks used in IALA Region A and Region B?
•White
49
349. Which of the following is one of the two celestial poles that is above the observer's horizon?
•Elevated pole
50
350. What is the variation of a compass if the True heading is 215° and the Magnetic heading is 210°?
•5°E
51
351. You are running parrallel to the coast and take a running fix using bearing of the same object. If you are making less speed than the actual speed used for the running fix, what will be the ship's position in relation with the coast?
•closer to the coast
52
352. How would you classify the sextant error when the index arm is not pivoted at the exact centre of the arc?
•Centering error
53
353. What is provided in the highest level of commercial navigational accuracy?
•DGPS, within a coverage area.
54
354. 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 knots. Find your speed made good over you intended course of 040°T?
•8.8 knots
55
355. What does a Global Positioning System receiver measure?
•The time betweeen transmission and reception of a signal from a satellite.
56
356. What is the deviation of a compass if the Compass heading is 213° and the Magnetic heading is 221°?
•8°E
57
357. What is the top mark (if any) of the Port hand lateral marks used in IALA Region B?
•Single green cylinder (can).
58
358. What is the used of a sling psychrometer?
•instrument used to measure relative humidity
59
359. There are two separate carrier frequencies that carry the signal transmitted by the GPS satellite. What is the first carrier frequency?
•1575.42 MHz
60
360. On a chart, cardinal marks of the compass indicates the position of a danger and the direction of the safe side. How would you determine a NORTH cardinal mark?
•It is painted black over yellow.
61
361. Which of the following statements regarding differential GPS is FALSE?
•It reduces geometric dilution of position
62
362. How would you show your understanding of an Echo Sounder's error if you encounter a velocity of propagation in water?
•If temperature, salinity or pressure changes, the acoustic wavelength changes therefore the depth recorded will be inaccurate.
63
363. What is the line drawn on a chart through places having the same value of magnetic dip?
•Isoclinal
64
364. What is the error introduced into the satellite signal in the ephemeris data?
•Epsilon error
65
365. 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.
66
366. Which routeing measure is described as areas within defined limits that constitute a boundary caused by natural obstacles, including those forming separation zones?
•Traffic lane.
67
367. Which of the following term refers to the direction of the flow of the current?
•Set
68
368. 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.
69
369. Referring to the Light List, a light has a nominal range of 14 miles and 26 feet 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
70
370. What is the latitude of a place where the sun is exactly at the zenith of the observer at Local Apparent Noon (LAN) of 22nd or 23rd day of September?
•Latitude 00 degrees 00 minutes
71
371. What is your idea of a Cold Wall?
•It is the sudden line of demarcation separating the Gulf Stream and the Labrador current.
72
372. What is the light rhythm (when fitted) of the SOUTH Cardinal marks used in IALA Region A and region B?
•VQ(6) + Long flash every 10 seconds or Q(6) + Long flash every 15 seconds
73
373. How would an excessive noise from the Steering Gear be developed?
•Excessive noise and vibrations from the steering gear is due to air bubbles in the oil pumps and pipings are subjected to air hammer leading to vibration.
74
374. How would you plan your course if it is crossing a TSS?
•Plan a course that is perpendicularly or as near as perpendicular.
75
375. Referring to the Light List, a light has a nominal range of 14 miles and 26 feet high. If the visibility is 14 nautical miles and your height of eye is 20.0 feet, at what approximate distance will you sight the light?
•11.1 nautical miles
76
376. What is the deviation of a compass if the Compass heading is 312° and the Magnetic heading is 297°?
•15°W
77
377. How would you ensure the operational readiness of the steering system?
•A vessel steering systems should be checked within 12 hours before departure.
78
378. Without the use of a wind scale, how would you estimate the probable force of the wind?
•If one third is deducted from the geostrophic wind, the result is good approximation to the surface wind.
79
379. When should a navigator rely on the position of floating aids to navigation?
•Only when fixed aids are not available
80
380. If your vessel steer 349°T and current sets NxW true at the rate of 2 knots. At 2215 hrs a light bore 034°T and at 2300 hrs the same light bore 079°T. Vessel's speed (by revolutions) is 18.5 kts. What is the distance offl light at 2300 hrs?
•15.375 miles
81
381. What is the color of the Starboard hand lateral marks in IALA Region A?
•Green.
82
382. How would you approximate the height above sea level the bases of the middle clouds?
•The base is between 6,500 ft - 20,000 ft
83
383. How would you classify navigational warnings in order of importance?
•Casualties to large navigational buoys, primary lights or lightships; Dangerous wrecks or obstruction to navigation; Changes in depth of water; Floating dangers-like containers, drifting buoys, icebergs.
84
384. What type of positioning system is enclosed by a semi-circle as plotted on a chart?
•Dead reckoning position.
85
385. How do gyrocompass repeaters replicate the direction reading of the master gyrocompass?
•Accurate electronic servo mechanism.
86
386. What is the meaning of the coded form M02/M05 in the weather report for LOWL at 070650Z
•The actual temperature is -2°and the dew point temperature is -5°C.
87
387. Weather observations provided by each weather station include all of the following EXCEPT:
•Predicted weather for the next twelve hours
88
388. How shall a Dead Reckoning course be plotted?
•Start from a fix, that is, a known departure point, and note the time.
89
389. What is meant by acronym VRM?
•Variable Range Marker
90
390. What is the color of the West cardinal marks used in IALA Region A and Region B?
•Yellow with a single broad horizontal black band.
91
391. What is the surest sign of the proximity of a tropical storm?
•If the interruption on the barometer is 5 mb or more below normal.
92
392. You are enroute 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.
93
393. You are planning a voyage from San Francisco to Japan. Which publication contains information on the ocean routes?
•Sailing Directions
94
394. What is the latitude of a place where the sun is exactly at the zenith of the observer at Local Apparent Noon (LAN) of June 21?
•23 deg. 27 min. North
95
395. What is your opinion regarding the best meteorological factors you should consider in planning an ocean passage?
•A choice of route that must be balanced between consideration of safety and time.
96
396. A vessel is following a leading light to keep her within the middle of a narrow channel. The chart indicates the range to be 001degree. If she is "on range" what course she is steering?
•True course 001 deg.
97
397. 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.
98
398. If you take a bearing of 264° to a lighthouse, what other bearing of another object would give the best fix?
•An object with a bearing of about 350°
99
399. What is the light color (when fitted) of the Port hand lateral marks used in IALA Region B?
•Green
100
400. 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