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.
2: On an isomagnetic chart, the line of zero variation is the __________.
N a. zero variation line N b. isogonic line N c. variation line Y d. agonic line 5: A vessel is steaming in east longitude on January 25 and crosses the International Date Line on an eastbound course at 0900 zone time. What is the date and time at Greenwich when the vessel crosses the line?
N a. 0900, 24 January Y b. 2100, 24 January N c. 2100, 25 January N d. 0900, 26 January 51: In the U.S. Aids to Navigation System, red and green horizontally-banded buoys mark __________.
N a. channels for shallow draft vessels N b. general anchorage areas N c. fishing grounds Y d. junctions or bifurcations 74: When operated over a muddy bottom, a fathometer may indicate __________.
N a. a shallow depth reading N b. a zero depth reading N c. no depth reading Y d. two depth readings 95: The difference in local time between an observer on 114°W and one on 119°W is __________.
N a. 1.25 minutes N b. 5 minutes Y c. 20 minutes N d. 75 minutes 138: The path that a vessel is expected to follow, represented on a chart by a line drawn from the point of departure to the point of arrival, is the __________.
N a. DR plot Y b. track line N c. heading N d. estimated course 290: The true wind is from 330°T, speed 6 knots. You want the apparent wind to be 30 knots from 10° on your port bow. To what course and speed must you change?
N a. Cn 240°, 28.0 knots N b. Cn 270°, 28.0 knots N c. Cn 180°, 30.0 knots Y d. Cn 090°, 32.5 knots 338: The illustration shows the symbols used on radio facsimile weather charts. The symbol indicated at letter "N" represents __________. (D042NG )
N a. hail N b. freezing rain Y c. rain N d. snow 356: When facing into the wind in the Northern Hemisphere the center of low pressure lies __________.
N a. directly in front of you N b. directly behind you N c. to your left and behind you Y d. to your right and behind you 391: When outbound from a U.S. port, a buoy displaying a flashing red light indicates __________.
N a. a junction with the preferred channel to the left N b. a sharp turn in the channel to the right Y c. the port side of the channel N d. a wreck to be left on the vessel's starboard side 478: The velocity of the apparent wind can be more than the true wind, and come from the same direction, if certain conditions are present. One condition is that the __________.
N a. ship's speed must be less than the true wind velocity N b. true wind must be from dead astern N c. true wind velocity must be faster than the ship's speed Y d. true wind must be from dead ahead 555: The letter D shown represents the __________. (D006NG )
N a. geoidal horizon N b. celestial horizon N c. visible horizon Y d. geometrical horizon 560: On 14 April 1981, a back sight is observed of the lower limb of the Sun. The height of eye is 45 feet. The index error is 2.5' on the arc. The sextant altitude (hs) is 117°14.6'. What is the observed altitude (Ho)?
N a. 63°01.9' N b. 63°03.4' N c. 63°07.4' Y d. 63°09.9' 623: An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer's vessel. Which of the following is NOT a characteristic of indirect echoes?
N a. Their bearing is almost constant, even when the true bearing of the contact changes appreciably. Y b. They always appear on a bearing of 90°From the true bearing of the contact. N c. The indirect echoes usually appear in shadow sectors. N d. When plotted, their movements are usually abnormal. 647: You will enter Argentia, Newfoundland, at 1200 on 5 October 1983, while keeping zone description +3 on the ship's clocks. What will be the height of tide at this time (based on the Canadian chart datum)?
N a. 0.5 feet N b. 1.2 feet Y c. 2.1 feet N d. 3.4 feet 664: Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel?
N a. Set and drift of the current Y b. Relative track information N c. Predicted time of CPA N d. Initial range of acquisition 671: You sight a buoy fitted with a double-sphere topmark. If sighted at night, this buoy would show a __________.
N a. quick-flashing red light N b. quick-flashing green light Y c. flashing white light showing a group of two flashes N d. flashing red light showing a group of three flashes 751: Under the IALA Buoyage Systems, a yellow buoy may mark __________.
N a. fish net areas N b. spoil areas N c. military exercise zones Y d. All of the above 886: The circulation around a low pressure center in the Northern Hemisphere is __________.
Y a. counterclockwise N b. variable N c. clockwise N d. anticyclonic 889: The Light List shows that a navigational light has a nominal range of 6 miles and a height above water of 18 feet (5.5 meters). Your height of eye is 47 feet (14.3 meters) and the visibility is 1.5 miles. At what approximate range will you first sight the light?
N a. 1.5 miles Y b. 2.0 miles N c. 6.0 miles N d. 12.7 miles 891: Under the IALA-A Buoyage System, a buoy indicating the preferred channel is to port would have __________.
N a. an even number N b. an odd number N c. a pillar shape Y d. horizontal bands 958: You are preparing a weather report form. Twenty-five percent of the sky is covered with clouds, and the anemometer indicates that the apparent wind is from 062° relative at 13 knots. You are on course 238°T at 22 knots. How should you encode group Nddff? (D041NG )
Y a. 20220 N b. 20613 N c. 30219 N d. 32413 1020: The Light List shows that a navigational light has a nominal range of 6 miles and a height above water of 18 feet (5.5 meters). Your height of eye is 40 feet (12.2 meters) and the visibility is 27.0 miles. At which approximate range will you first sight the light?
N a. 5.6 miles N b. 6.4 miles Y c. 9.8 miles N d. 12.1 miles 1076: Which is TRUE concerning the speed of fronts?
Y a. Cold fronts move faster than warm fronts. N b. Cold fronts move slower than warm fronts. N c. Cold fronts and warm fronts move with equal speed. N d. Cold fronts move slower at the northern end and faster at the southern end. 1078: The description "Racon" beside an illustration on a chart would mean a __________.
N a. radar conspicuous beacon Y b. radar transponder beacon N c. radar calibration beacon N d. circular radio beacon 1267: What will be the velocity of the tidal current at Coxsackie, NY, at 0945 EST (ZD +5) on 11 March 1983?
N a. 0.3 knot Y b. 0.7 knot N c. 1.2 knots N d. 1.9 knots 1304: The distance to the nearest vertex from any point on a great circle track cannot exceed __________.
Y a. 5400 nautical miles N b. 5840 nautical miles N c. 6080 nautical miles N d. 10,800 nautical miles 1345: A large automated navigational buoy, such as those that have replaced some lightships, would be shown on a chart by which symbol in illustration D015NG?
N a. D N b. C Y c. B N d. A 1350: You are running parallel to the coast and plotting running fixes using bearings of the same object. You are making more speed than assumed for the running fix. In relation to the position indicated by the fix you will be __________.
N a. closer to the coast Y b. farther from the coast N c. on the track line ahead of the fix N d. on the track line behind the fix 1378: The latitude of the upper vertex of a great circle is 36°N. What is the latitude of the lower vertex?
N a. 36°N N b. 0° Y c. 36°S N d. Cannot be determined from the information given 1384: Which type of cloud is indicated by number 9? (D039NG )
N a. Cumulus Y b. Cumulonimbus N c. Altostratus N d. Stratocumulus 1426: Fog is most commonly associated with a(n) __________.
Y a. warm front at night N b. low pressure area N c. anticyclone N d. cold front in the spring 1502: You are running parallel to the coast and take a running fix using bearings of the same object. If you are making less speed than used for the running fix, in relation to the position indicated by the fix, you will be __________.
Y a. closer to the coast N b. farther from the coast N c. on the track line ahead of the fix N d. on the track line behind the fix 1517: When determining compass error by an azimuth of Polaris, you enter the Nautical Almanac with the __________.
N a. GHA Aries Y b. LHA Aries N c. LHA Polaris N d. GHA Polaris 1592: A white buoy marked with an orange rectangle indicates __________.
N a. an anchorage N b. a fish net area N c. mid-channel Y d. general information 1618: The Light List indicates that a light has a nominal range of 14 miles and is 26 feet high. If the visibility is 4 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?
Y a. 7.5 miles N b. 9.6 miles N c. 11.2 miles N d. 14.0 miles 1631: Which picture shows an occulting light? (D034NG )
N a. A Y b. B N c. C N d. D 1647: Cumulonimbus clouds are formed by __________.
Y a. vertical air movements N b. heavy rainstorms N c. horizontal air movements N d. any movement of moist air 1651: From which type of cloud can a tornado or waterspout develop?
N a. Nimbostratus N b. Altostratus Y c. Cumulonimbus N d. Cirrus 1724: What is the first visible indication of the presence of a tropical cyclone or hurricane?
N a. Stratocumulus clouds or strange birds N b. Rain and increasing winds Y c. An exceptionally long swell N d. Dark clouds and the "bar" of the storm 1738: In the Northern Hemisphere, the right half of the storm is known as the dangerous semicircle because __________.
N a. The wind speed is greater here since the wind is traveling in the same general direction as the storm's track N b. the direction of the wind and seas might carry a vessel into the path of the storm N c. the seas are higher because of greater wind speed Y d. All of the above 1848: The buoy symbol printed on your chart is leaning to the northeast. This indicates __________.
N a. you should stay to the north or east of the buoy N b. you should stay to the west or south of the buoy N c. the buoy is a major lighted buoy Y d. nothing special for navigational purposes 1890: A vessel heading SSE is on a course of __________.
N a. 112.5° N b. 135.0° Y c. 157.5° N d. 180.0° 2008: What term is used to describe a tank barge constructed with the structural framing outside the cargo tank and the cargo tank plating separated from the shell plating?
N a. Shell plated Y b. Double hull N c. Hopper type N d. Independent tank 2030: A vessel heading NE is on a course of __________.
N a. 022.5° Y b. 045.0° N c. 067.5° N d. 090.0° 2048: You are upbound approaching a lock and dam and see two green lights in a vertical line. This indicates __________.
Y a. the downstream end of an intermediate wall N b. that a double lockage is in progress N c. the downstream end of the land wall N d. the navigable pass of a fixed weir dam 2140: The visible range marked on charts for lights is the __________.
N a. minimum distance at which the light may be seen with infinite visibility N b. minimum distance at which the light may be seen based on a 12 mile distance to visible horizon N c. maximum distance the light may be seen restricted by the height of the light and the curvature of the earth Y d. maximum distance at which a light may be seen in clear weather with 10 miles visibility 2163: The letter C in illustration D006NG represents the __________.
N a. visible horizon N b. geoidal horizon Y c. celestial horizon N d. sensible horizon 2472: The Sun is closest to the Earth in what month?
N a. October N b. July N c. April Y d. January 2626: What information is found in the chart title?
N a. Date of the first edition N b. Date of the edition and, if applicable, the revision Y c. Information on the sounding datum N d. Information on which IALA buoyage system applies 2656: What is the equivalent of 0 min. 16 sec. in arc units?
N a. 0°32' N b. 0°16' Y c. 0°04' N d. 0°01' 2675: When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________.
N a. come left Y b. continue on the present course N c. come right N d. wait until the lights are no longer in a vertical line 2680: The angle measured eastward from the vernal equinox along the celestial equator often expressed in time units is the __________.
N a. Greenwich sidereal time Y b. right ascension N c. local sidereal time N d. sidereal hour angle 2830: The proper way to approach a downstream lock where there is an outdraft is to be __________.
N a. wide out from the land wall, keeping the stern in at all times N b. wide out from the land wall, keeping the stern out at all times Y c. close in to the land wall, keeping the stern in at all times N d. close in to the land wall, keeping the stern out at all times 2831: A coastal chart could have a scale of __________.
N a. not more than 1:25,000 N b. 1:35,000 Y c. 1:100,000 N d. 1:500,000 3000: All aids to navigation listed in the Mississippi River System Light List are shown as miles from a reference point and on the __________.
N a. east or west bank Y b. left or right descending bank N c. port or starboard side of the vessel N d. left or right ascending bank 3002: The diurnal variation of pressure is most noticeable __________.
N a. above the polar circles N b. in a low pressure area N c. during periods of low temperatures Y d. in the doldrums 3052: The Sailing Directions contain information on __________.
N a. required navigation lights N b. lifesaving equipment standards N c. casualty reporting procedures Y d. currents in various locations 3065: Raster-scan chart data is __________.
N a. the only format recognized by IMO/IHO N b. organized into many separate files N c. composed of files that are smaller than vector files Y d. a digitized "picture" of a chart in one format and one layer 3108: Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT __________.
N a. navigation status N b. ship's heading Y c. port of origin N d. time stamp