451) It is the component of the Earth's field which operates the compass, that is , gives the needle the ability to point north. It is called ________. None of the stated options
452) Liquid magnetic compass is referred at sea than the "Dry Card Type" of compass because of the following, except. all of the options
453) A permanent magnets used for compensation ship's permanent poles, is Permanent magnets corrector
454) These component force of the ship's total magnetic force is split into three components except _________. Directive force components
455) A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 312°. The quadrantal spheres are arranged athwartships. What action should be taken to remove this error during compass adjustment? If the quadrantal spheres are all of the way out, replace them with smaller spheres.
456) What is used to correct for both induced and permanent magnetism, and must be readjusted with radical changes in latitude? Heeling magnet
457) A vessel on DR position 36 degrees 10'N and 028 degrees 20' W observed the sun's bearing at sunrise at 112 degrees. Declination of the sun is 03 degrees 17.1' S and the variation of the locality is 4 degrees W. Find the amplitude E 004 degrees S
458) While steering a course of 150°T, you wish to observe a body for a latitude check. What would the azimuth have to be? 000°T
459) You are on course 312°T. To check the speed of your vessel you should observe a celestial body on which bearing? 312°
460) The GP of a body for a high altitude sight is determined from the declination and the __________. Greenwich hour angle
461) When plotting a circle of equal altitude for a high altitude sight, the radius of the circle is determined by the formula __________. 90° - Ho
462) You are on course 061°T. To check the longitude of your vessel you should observe a celestial body on which bearing? 090°
463) Which of the four figures below has the correct position line? Approx. Pos. N50°00' W30°00' 1200 GMT. Course: 090°, speed: 12 knots, bearing of the sun: 200°, correction: 00°02' (observed altitude - computed altitude). Figure 2 is correct.
464) Convert amplitude W 13.8 degrees N in 360 degrees quadrantal notation. 283.8 degrees
465) What is the position can you derive during meridian passage? latitude line
466) What line of position can you derive meridian passage? Latitude line
467) If the observer is at Lat. 50 N, declination of the sun is 15 S, which of the following is observed? Darkness is longer than daylight
468) If the observer is on the equator on March 21, which of the following occurs? Day and night are equal
469) If the observer is at lat. 50 N, declination of the sun is 15 N, which of the following is observed? Darkness is longer than daylight
470) If the observer is at Lat. 50 N, declination is 15 N, which of the following is observed? Sun crosses the Prime Vertical twice
471) Find the LHA of a star if the GHA of the star is 81 degrees 57.3' and the longitude is 174 degrees 32.9' W 267 degrees 24.4'
472) Civil twilight starts at 1812 zone time on 26 August 1981, Your DR position at that time is LAT 21°06'S, LONG 14°56' W. Which statement concerning the planets available for evening sights is TRUE? Venus may be identified from Saturn and Jupiter because it is the brightest.
473) In general, the most effective period for observing stars and planets occurs during the darker limit of __________. civil twilight
474) In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________. using a dip correction based on the height of eye above the ice
475) You are on course 042°T. To check the course of your vessel you should observe a celestial body on which bearing? 132°
476) You are on course 209°T. In order to check the longitude of your vessel, you should observe a celestial body on which bearing? 270°
477) What is the major advantage of high altitude observations? The same body can be used for a fix from observations separated by several minutes.
478) At upper transit, if the zenith distance is 34°, the geographical distance from the observer to a body's GP is __________. 2040 miles
479) While steering a course of 150°T, you wish to observe the Sun for a speed check. What would the azimuth have to be? 150°T
480) While steering a course of 150°T, you wish to observe the Sun for a speed check. What would the azimuth have to be? 150°T
481) You are on course 226°T. In order to check the latitude of your vessel, you should observe a celestial body on which bearing? 000°
482) You are on course 238°T. To check the course of your vessel you should observe a celestial body on which bearing? 328°
483) You are on course 303°T. To check the speed of your vessel you should observe a celestial body on which bearing? 123°
484) Your vessel is at the equator at midnight on 1 January, and a star is observed rising. At what time will this same star rise on 1 February, assuming your vessel's location is still at the equator? 2158
485) The distance in miles between the circle of equal altitude for the observed altitude (Ho) and the circle of equal altitude for the computed altitude (Hc) is the __________. intercept
486) He is a British Carpenter's son who first develop a time piece that could keep time with sufficient accuracy on board a moving ship. John Harrison
487) A meridian passage, the bearing of the body will be either north or south
488) The sine of 30 can be expressed by which of the following ratios? 1/3
489) The sun moves eastward among the stars, causing the star to rise four minutes earlier than the previous night. This is equivalent to how much hour angle the celestial sphere shifts westward? 1 degree
490) The navigational system which positioning is derived from heavenly bodies observation. Celestial navigation
491) There are two dominant formations in the Summer Sky Latitude 40 degrees North. One to the North the other to the South. They are separated sufficiently that two myths serve better than one. The Southern Sky is dominated by this constellation Scorpio
492) The line of position determined from a sight with an observed altitude (Ho) of 88°45.0' should be __________. plotted as an arc around the GP of the body
493) You are on course 146°T. To check the speed of your vessel you should observe a celestial body on which bearing? 146°
494) The line of position should be plotted as a circle around the GP of the body when the Ho exceeds what minimum value? 87°
495) When correcting apparent altitude to observed altitude, you do NOT apply a correction for __________. inaccuracies in the reference level
496) If we are standing on a level ground, our vision encompasses an area of about__________. 60 sq. km. of the surface area of our planet
497) A semi diameter correction is applied to observations of _____________? all of the options
498) An amplitude of the Sun in high latitudes _____________? is most accurate when the Sun's center is observed on the visible horizon
499) Your ship is steering 190 deg by standard compass. The variation of locality is 1 deg E and deviation is 14 deg W. What is the true course? 176 degrees
500) The ecliptic is __________. the path the Sun appears to take among the stars
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