This is an interactive test. Read each question and select the proper answer by clicking on the appropriate answer. If a "Y" appears, your choice is correct. If a "N" appears, more study may be in order.
32: The datum used for soundings on charts of the Atlantic Coast of the United States is mean __________.
N a. low water Y b. lower low water N c. higher high water N d. high water 67: What is the definition of height of tide?
Y a. The vertical distance from the tidal datum to the level of the water at any time N b. The vertical difference between the heights of low and high water N c. The vertical difference between a datum plane and the ocean bottom N d. The vertical distance from the surface of the water to the ocean floor 84: When using an echo sounder in deep water, it is NOT unusual to __________.
Y a. receive a strong return at about 200 fathoms (366 meters) during the day, and one nearer the surface at night N b. receive a first return near the surface during the day, and a strong return at about 200 fathoms (366 meters) at night N c. receive false echoes at a constant depth day and night N d. have to recalibrate every couple of days due to inaccurate readings 86: A weather forecast states that the wind will commence backing. In the Northern Hemisphere, this would indicate that it will __________.
N a. shift in a clockwise manner Y b. shift in a counterclockwise manner N c. continue blowing from the same direction N d. decrease in velocity 246: The consistent winds blowing from the horse latitudes to the doldrums are called the __________.
N a. prevailing westerlies N b. polar easterlies Y c. trade winds N d. roaring forties 287: The datum from which the predicted heights of tides are reckoned in the tide tables is the same as that used for the charts of the locality. The depression of the datum below mean sea level for Hampton Roads, Virginia is __________.
N a. between -.7 and +.5 feet N b. between 1.9 and 3.2 feet N c. 4.1 feet Y d. 1.2 feet 342: A polyconic projection is based on a __________.
N a. plane tangent at one point N b. cylinder tangent at one parallel N c. cone tangent at one parallel Y d. series of cones tangent at selected parallels 409: On November 1st the zone time is 1700 EST (ZD +5) in LONG 75°W. What is the corresponding zone time and date in LONG 135°E?
Y a. 0700, November 2nd N b. 0700, November 1st N c. 2200, November 1st N d. 2200, October 31st 409: On November 1st the zone time is 1700 EST (ZD +5) in LONG 75°W. What is the corresponding zone time and date in LONG 135°E?
Y a. 0700, November 2nd N b. 0700, November 1st N c. 2200, November 1st N d. 2200, October 31st 430: The southeast trade winds actually blow toward the __________.
N a. southeast N b. south N c. east Y d. northwest 431: When a buoy marks a channel bifurcation, the preferred channel is NOT indicated by __________.
N a. the shape of an unlighted buoy N b. the light color of a lighted buoy N c. the color of the topmost band Y d. whether the number is odd or even 501: Which of the buoys listed below could be used to mark an anchorage?
N a. White buoy numbered "3" N b. White buoy with a green top N c. White buoy with orange bands Y d. Yellow buoy lettered "N" 524: An anemometer on a moving vessel measures __________.
Y a. apparent wind speed only N b. true wind speed and true wind direction N c. true wind speed only N d. apparent wind speed and true wind direction 608: In which voyage, between two points, is the rhumb line distance NOT approximately the same as the great circle distance?
N a. The two points are in low latitudes in the same hemisphere. Y b. The two points are in high latitudes in the same hemisphere. N c. The two points are near the equator, but in different hemispheres. N d. One point is near the equator, one point is in a high latitude, and both are near the 180th meridian. 610: The apparent wind's speed can be zero, but only when two conditions are present. One condition is that the true wind __________.
N a. must be from dead ahead N b. speed must be zero Y c. must be from dead astern N d. must be on the beam 716: Standard atmospheric pressure in inches of mercury is __________.
N a. 30.00 N b. 28.92 Y c. 29.92 N d. 29.00 731: Under the IALA Buoyage Systems, a vertically-striped buoy may be striped red and __________.
N a. green N b. black Y c. white N d. yellow 742: You are preparing to take a tow from San Diego to Portland, OR. Good seamanship would require that you have on board, available for reference and use, all of the following EXCEPT the __________.
N a. Coast Pilot N b. harbor and coastal charts for ports of refuge enroute Y c. Sailing Directions (Enroute) N d. Light List 745: Retrograde motion is the __________.
N a. movement of the points of intersection of the planes of the ecliptic and the equator Y b. apparent westerly motion of a planet with respect to stars N c. movement of a superior planet in its orbit about the Sun N d. movement of the celestial north pole in an elliptical pattern in space 761: Under the IALA Buoyage Systems, a safe water mark may NOT __________.
N a. be spherical N b. display a white light N c. be lettered Y d. show a quick flashing light 819: Which sextant has an index error of 4'20" off the arc? (D050NG )
Y a. A N b. B N c. C N d. D 825: While steering a course of 150°T, you wish to observe the Sun for a speed check. What would the azimuth have to be?
N a. 000°T N b. 090°T Y c. 150°T N d. 240°T 895: The ecliptic is __________.
Y a. the path the Sun appears to take among the stars N b. the path the Earth appears to take among the stars N c. a diagram of the zodiac N d. a great circle on a gnomonic chart 941: While preparing to enter a Brazilian port, you see ahead a red and green horizontally-striped buoy. The upper band is red. What action should you take?
N a. Alter course to leave the buoy to port. Y b. Alter course to leave the buoy to starboard. N c. Pass the buoy close aboard on either side. N d. Pass the buoy well clear on either side. 984: The bases of middle clouds are located at altitudes of between __________.
N a. 3,000 to 6,500 feet (914 to 1981 meters) Y b. 6,500 to 20,000 feet (1981 to 6096 meters) N c. 10,000 to 35,000 feet (3048 to 10,668 meters) N d. 20,000 to 60,000 feet (6096 to 18,288 meters) 985: A time diagram is a diagram on the plane of the __________.
N a. celestial meridian Y b. celestial equator N c. celestial horizon N d. principal vertical circle 1123: What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?
N a. Quadrantal spheres Y b. Heeling magnets N c. Athwartships magnets N d. Fore-and-aft magnets 1141: What is characteristic of an isophase light?
N a. 4 sec. flash, 2 sec. eclipse, 3 sec. flash, 2 sec. eclipse N b. 2 sec. flash, 5 sec. eclipse Y c. 1 sec. flash, 1 sec. eclipse N d. 6 sec. flash, 3 sec. eclipse 1169: The symbols shown are used on radio facsimile weather charts. The symbol indicated at letter "O" represents __________. (D042NG )
Y a. sandstorms N b. thunderstorms N c. snow N d. rain showers 1215: Daylight savings time is a form of zone time that adopts the time __________.
N a. two zones to the east N b. two zones to the west Y c. one zone to the east N d. one zone to the west 1221: On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. The red sector __________.
N a. indicates the limits of the navigable channel Y b. indicates a danger area N c. is used to identify the characteristics of the light N d. serves no significant purpose 1424: Except for N-S courses, and E-W courses on the equator, a great circle track between two points, when compared to a rhumb line track between the same two points, will __________.
N a. always be nearer to the equator Y b. always be nearer to the elevated pole N c. be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere N d. be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions 1519: You are preparing a weather report form, WS Form B-80. Your position is LAT 10°38'S, LONG 00°14'E. How would this be encoded? (D041NG )
N a. LAT 10.6°S, LONG 00.2°E N b. L106S, 30002 N c. 10385, 0014E Y d. 99106, 30002 1527: Your vessel is on course 270°T, speed 10 knots. The apparent wind is from 10° off the port bow, speed 30 knots. From which direction is the true wind?
N a. 345°T Y b. 255°T N c. 165°T N d. 075°T 1560: Under the IALA-A and B Buoyage Systems, a buoy with alternating red and white vertical stripes indicates __________.
Y a. that there is navigable water all around N b. an isolated danger exists N c. that the preferred channel is to port N d. that the preferred channel is to starboard 1563: Neap tides occur only __________.
N a. at a new or full Moon N b. when the Sun, Moon, and Earth are in line N c. at approximately 28-day intervals Y d. when the Moon is at quadrature 1710: A gale is characterized by a wind speed of __________.
N a. 10 to 20 knots Y b. 34 to 47 knots N c. 48 to 63 knots N d. 64 to 83 knots 1718: A hurricane is characterized by winds of __________.
N a. up to 33 knots N b. 34 to 47 knots N c. 48 to 63 knots Y d. 64 knots or greater 1718: A hurricane is characterized by winds of __________.
N a. up to 33 knots N b. 34 to 47 knots N c. 48 to 63 knots Y d. 64 knots or greater 1718: A hurricane is characterized by winds of __________.
N a. up to 33 knots N b. 34 to 47 knots N c. 48 to 63 knots Y d. 64 knots or greater 1725: Your present weather is sunny with a steady barometer. A low swell approaches your vessel from the south with crests passing at relatively long periods of about four per minute. This usually indicates __________.
N a. a warm front from the south Y b. a tropical cyclone south of your vessel N c. a hurricane about 100 miles south of your vessel and heading in your direction N d. an extra-tropical cyclone 1763: Weather patterns in the Gulf Coast area of the United States are __________.
Y a. those of a transition zone between tropical and a temperate area N b. those of a tropical region N c. extremely hot in summer N d. tropical over Florida and subtropical over the rest of the Gulf Coast area 1826: The illustration represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter D in the illustration? (D036NG )
N a. One red light Y b. Two green lights N c. Three green lights N d. No light 1842: What is the major problem with taking high altitude observations?
N a. Possible errors due to unusual refraction may exist. N b. The tables are not as accurate due to inherent errors in the spherical triangle at high altitudes. N c. Rapidly changing altitudes make it difficult to get an accurate altitude. Y d. It is difficult to establish the point where the sextant is vertical to the horizon. 1871: A lighted buoy to be left to starboard, when entering a U.S. port from seaward, shall have a __________.
N a. green light N b. white light Y c. red light N d. light characteristic of Morse (A) 1905: In order to insure that the racon signal is visible on your 3 cm radar, the __________.
N a. 10 cm radar should be placed on standby or turned off N b. gain control should be turned to maximum N c. radar should be stabilized, head up Y d. rain clutter control should be off but, if necessary, may be on low 1956: In the North Sea area, you sight a buoy showing a quick white light with 6 flashes, followed by one long flash at 15 second intervals. Which of the four topmarks shown would be fitted to this buoy? (D030NG )
Y a. A N b. B N c. C N d. D 2050: The point where the vertical rise or fall of tide has stopped is referred to as __________.
N a. slack water N b. the rip tide Y c. the stand of the tide N d. the reverse of the tide 2294: What celestial body may sometimes be observed in daylight?
N a. New Moon N b. Saturn N c. Sirius Y d. Venus 2341: Which statement concerning illustration D010NG is correct? (Soundings and heights are in meters)
N a. Maury Lightship swings about her anchor on a circle with a 21-meter diameter. N b. The position of the lightship is indicated by the center of the star on the symbol's mast. Y c. The sunken wreck southwest of Beito Island shows the hull or superstructure above the sounding datum. N d. There is a 12-meter deep hole inside the 5-meter curve just west of Beito Island. 2452: The permanent magnetism of a vessel may change in strength due to __________.
N a. the nature of the cargo being carried N b. changes in heading Y c. major structural repair N d. All of the above 2525: Daylight savings time is a form of zone time that adopts the time __________.
N a. two zones to the west N b. two zones to the east N c. one zone to the west Y d. one zone to the east 2588: You are approaching an open drawbridge and sound the proper signal. You receive no acknowledgment from the bridge. Which action should you take?
Y a. Approach with caution and proceed through the open draw. N b. Approach under full control to a position no closer than 400 yards from the bridge and await a signal from the bridge. N c. Hold in the channel as a vessel is closing the bridge from the other direction. N d. Resound the opening signal and do not pass through the bridge until signals have been exchanged. 2598: A vessel is proceeding downstream in a narrow channel on the Western Rivers when another vessel is sighted moving upstream. Which vessel has the right of way?
N a. The vessel moving upstream against the current Y b. The vessel moving downstream with a following current N c. The vessel located more towards the channel centerline N d. The vessel with the least amount of maneuverability 2610: A line on the Earth parallel to the equator is a __________.
N a. gnomonic curve Y b. small circle N c. meridian N d. great circle 2658: You must draw a plotting sheet covering latitudes 45°N to 49°N and longitudes 179°E to 178°W. If the distance between each degree of longitude is 5 3/4 inches, what is the distance between latitude 45°N and latitude 49°N?
N a. 33.1 inches N b. 33.3 inches Y c. 33.6 inches N d. 33.9 inches 2695: You are plotting a running fix in an area where there is a determinable current. How should this current be treated in determining the position?
N a. The drift should be added to the ship's speed. N b. The current should be ignored. Y c. The course and speed made good should be determined and used to advance the LOP. N d. The set should be applied to the second bearing. 2707: You will find information about the duration of slack water in the __________.
Y a. Tidal Current Tables N b. Tide Tables N c. American Practical Navigator N d. Sailing Directions 2849: You take a bearing of 086° of a lighthouse. What bearing of another object would give the best fix?
Y a. 000° N b. 066° N c. 112° N d. 271° 2968: Some locations maintain a zone time of -13. What are the zone time and date if the Greenwich time and date are 0152, 10 January?
N a. 0052, 9 January N b. 0258, 9 January Y c. 1452, 10 January N d. 0052, 11 January