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.
78: A single line of position combined with a dead-reckoning position results in a(n) __________.
N a. assumed position Y b. estimated position N c. fix N d. running fix 80: When the moon is at first quarter or third quarter phase, what type of tides will occur?
N a. Apogean N b. Perigean Y c. Neap N d. Spring 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 216: The prevailing winds in the band of latitude from approximately 5°N to 30°N are the __________.
N a. prevailing westerlies Y b. northeast trade winds N c. southeast trade winds N d. doldrums 229: The shoreline on charts generally represents the mean __________.
Y a. high water line N b. low water line N c. low water spring line N d. tide level 245: Yesterday you took a time tick using the 1200 GMT broadcast, and the chronometer read 11h 59m 59s. Today at the 1200 GMT time tick the chronometer read 00h 00m 01s. What is the chronometer error?
N a. Gaining 2 seconds N b. Losing 2 seconds N c. Fast 2 seconds Y d. Fast 1 second 317: The time meridian used for tide computations in New York Harbor is __________.
N a. 52°30'W N b. 60°00'W Y c. 75°00'W N d. 82°30'W 344: A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has __________.
N a. error of perpendicularity Y b. side error N c. prismatic error N d. centering error 477: Determine the height of the tide at 1430 EST (ZD +5) at New Bedford, MA, on 10 April 1983.
N a. 1.1 feet N b. 1.2 feet Y c. 1.4 feet N d. 1.7 feet 499: Which of the symbols shown represents an occluded front? (D018NG )
N a. A N b. B N c. C Y d. D 526: When a hurricane passes over colder water or land and loses its tropical characteristics, the storm becomes a(n) __________.
N a. high pressure area Y b. extratropical low-pressure system N c. tropical storm N d. easterly wave 552: A Mercator chart is a __________.
Y a. cylindrical projection N b. simple conic projection N c. polyconic projection N d. rectangular projection 868: Your ship received a HYDROLANT advising of a special warning to mariners from the Department of State for ships in the Persian Gulf. You are 400 miles south of, and bound for, the Persian Gulf. What action should you take?
N a. Continue on course as the warning is advisory in nature only. Y b. Send an AMVER report and acknowledge receipt of the warning. N c. Remain a minimum of 500 miles outside the Persian Gulf and maintain radio silence. N d. Send a MERWARN message advising your position, course, speed and intentions. 883: When changing from a compass course to a true course you should apply __________.
N a. variation N b. deviation Y c. variation and deviation N d. a correction for the direction of current set 983: Error may be introduced into a magnetic compass by __________.
N a. making a structural change to the vessel N b. a short circuit near the compass N c. belt buckles Y d. All of the above 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 1069: What do the numbers on isobars indicate?
Y a. barometric pressure N b. temperature N c. rain in inches N d. wind speed 1166: A series of brief showers accompanied by strong, shifting winds may occur along or some distance ahead of a(n) __________.
N a. upper front aloft N b. cyclone N c. occluded front Y d. cold front 1175: Solid green arrows on the main body of a pilot chart indicate __________.
N a. prevailing wind directions Y b. prevailing ocean current directions N c. probable surface current flow N d. shortest great circle routes 1246: What weather change accompanies the passage of a cold front in the Northern Hemisphere?
N a. Wind shift from northeast clockwise to southwest N b. Steady dropping of barometric pressure N c. Steady precipitation, gradually increasing in intensity Y d. A line of cumulonimbus clouds 1257: What will be the velocity of the tidal current 1.0 mile southwest of Lewis Pt., RI, at 1501 EST (ZD +5) on 4 April 1983?
Y a. 0.7 knot N b. 1.4 knots N c. 1.6 knots N d. 1.9 knots 1324: When daylight savings time is kept, the time of tide and current calculations must be adjusted. One way of doing this is to __________.
Y a. add one hour to the times listed under the reference stations N b. subtract one hour from the time differences listed for the subordinate stations N c. apply no correction as the times in the reference stations are adjusted for daylight savings time N d. add 15° to the standard meridian when calculating the time difference 1408: An occluded front is caused by a(n) __________.
N a. low pressure area N b. high pressure area N c. area of calm air Y d. cold front overtaking a warm front 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 1430: The Light List indicates that a light has a nominal range of 14 miles and is 42 feet high (12.8 meters). If the visibility is 6 miles and your height of eye is 20 feet (6.1 meters), at what approximate distance will you sight the light?
N a. 20.1 miles Y b. 10.0 miles N c. 7.6 miles N d. 6.0 miles 1491: You are on course 138°T. To check the latitude of your vessel you should observe a celestial body on which bearing?
N a. 138° N b. 270° N c. 318° Y d. 000° 1498: A true bearing of a charted object, when plotted on a chart, will establish a __________.
N a. fix Y b. line of position N c. relative bearing N d. range 1564: What is a characteristic of cardinal marks?
Y a. Light rhythms indicating directional orientation N b. Vertical stripes N c. Square or triangular topmarks N d. Number-letter combinations for identification 1574: Information about currents around Pacific Coast ports of the U.S. is found in the __________.
N a. Nautical Almanac N b. Tide Tables Y c. Tidal Current Tables N d. Ocean Current Tables 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 1620: You are at anchor in the anchorage at the entrance to Delaware Bay. If you weigh anchor at 1445 DST (ZD +4) on 24 July 1983 and proceed northbound enroute to Philadelphia at a speed of 10 knots, you will have __________.
N a. a flood current the entire trip N b. a flood current from Ship John Shoal Lt. to Philadelphia N c. an ebb current north of New Castle, DE Y d. a weak flood between Reedy Island and Edgemoor 1680: A weather front exists when __________.
N a. air masses of the same temperature meet Y b. air masses of different temperatures meet N c. many clouds create a differential in air density N d. two lows are separated by a ridge of higher pressure 1682: Which of the listed properties does warm air possess?
N a. It rises above cooler air and cools as it rises. N b. Atmospheric pressure drops as warm air rises. N c. Moisture in warm air condenses as the air is cooled. Y d. All of the above 1697: In the Northern Hemisphere, if the center of a high pressure area is due west of you, what wind direction would you expect?
N a. South to west N b. South to east Y c. North to west N d. North to east 1793: Which weather element cannot be measured accurately while on board a moving vessel?
N a. relative humidity N b. temperature Y c. true wind speed N d. atmospheric pressure 1866: What term is used to describe a tank barge constructed with the structural framing inside the cargo tank and the side shell plating containing the cargo?
Y a. Single hull N b. Shell plated N c. Hopper type N d. Independent tank 2006: What is the relative bearing of an object broad on the port beam?
N a. 315° N b. 300° Y c. 270° N d. 235° 2022: The GP of a body for a high altitude sight is determined from the declination and the __________.
N a. right ascension N b. sidereal hour angle Y c. Greenwich hour angle N d. observed altitude 2084: You are approaching Gallipolis Lock and Dam. The traffic signal light is flashing red. You should __________.
Y a. hold your position and not attempt to enter the lock N b. approach the lock slowly under full control N c. proceed at normal speed to enter the lock N d. None of the above 2142: Which lights would you see on the Illinois waterway when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?
N a. Green over amber (yellow) Y b. Red over amber (yellow) N c. Red over blue N d. Green over red 2328: Universal time (UTI) is another name for __________.
N a. sidereal time Y b. Greenwich mean time N c. ephemeris time N d. atomic time 2409: You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound?
N a. Sound the request-for-opening signal for the first bridge only, who will notify the second bridge of your approach N b. Sound the request-for-opening signal twice in succession to indicate you must pass through both bridges N c. Sound the request-for-opening signal, pause for about 10 seconds, then sound two prolonged blasts. Y d. Sound the request-for-opening signal and, after the bridge acknowledges it, sound the request-for-opening signal for the second bridge. 2519: The standard time meridian for zone description -12 is __________.
N a. 165.0°E N b. 172.5°E Y c. 180.0° N d. 172.5°W 2602: The lunar day is also known as the __________.
N a. lunitidal interval N b. vulgar establishment of the port N c. nodal day Y d. tidal day 2673: A bluff bar is a bar __________.
N a. extending out from a bluff alongside the river N b. that tends to give a false indication of its position Y c. that has a sharp drop off into deep water N d. that is perpendicular to the current 2718: A power-driven vessel operating in a narrow channel with a following current, on the Western Rivers, is meeting an upbound vessel. Which statement is TRUE?
N a. The downbound vessel has the right-of-way. N b. The downbound vessel must initiate the required maneuvering signals. N c. The downbound vessel must propose the manner and place of passage. Y d. All of the above 2826: You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix?
N a. 356° Y b. 102° N c. 144° N d. 201° 2826: You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix?
N a. 356° Y b. 102° N c. 144° N d. 201° 2884: The pictures shown represent the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? (D011NG )
Y a. Ship No. 1 does not appear as an individual target due to the effect of beam width. N b. Small island is not detected due to the multiple echo effect from the mountain. N c. A tangent bearing of the headland to the south-southeast is corrected by subtracting one-half of the beam width. N d. Ship No. 2 is not detected due to the side lobe effect of radar reflecting from the mountain. 2960: What is NOT found in the Mississippi River System Light List?
Y a. Distance that a lighted aid to navigation can be seen at night N b. Distance between major points on the Mississippi River N c. A color plate showing the details of the aids to navigation used on the Mississippi River N d. Times of Coast Guard broadcasts concerning river stages 2972: You are in a channel inbound from sea. A daymark used to mark a channel junction when the preferred channel is to starboard will have the shape indicated by what letter in illustration D045NG?
Y a. A N b. B N c. C N d. D 2973: You should plot a dead reckoning position after every __________.
N a. course change N b. speed change N c. fix or running fix Y d. All of the above 3003: The height of tide is the __________.
Y a. difference between the depth of the water and the area's tidal datum N b. depth of water at a specific time due to tidal effect N c. difference between the depth of the water and the high water tidal level N d. difference between the depth of the water at high tide and the depth of the water at low tide 3007: A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles, in a locale off the East coast of the US, is approximately __________.
N a. 2 1/2 hours N b. 3 1/2 hours N c. 6 1/4 hours Y d. 12 1/2 hours 3018: You take a bearing of 356° of a lighthouse. Which bearing of another object would give the best fix?
N a. 013° N b. 178° Y c. 256° N d. 342° 3026: A compass card without north-seeking capability that is used for relative bearings is a(n) __________.
N a. bearing circle Y b. pelorus N c. bearing bar N d. alidade 3029: On 13 November 1981 you observe a back sight of the upper limb of the Moon. The sextant altitude (hs) is 110°31.2'. The height of eye is 46 feet and the index error is 2.0' on the arc. The horizontal parallax is 61.3'. What is the observed altitude (Ho)?
N a. 70°11.8' Y b. 69°41.8' N c. 69°25.6' N d. 69°18.4' 3032: The direction in which a vessel is steered is the course. The path actually followed is the __________.
N a. route N b. track N c. heading Y d. course over the ground 3042: How long would a steady wind need to blow in order to create a wind driven current?
N a. 2 hours N b. 6 hours Y c. 12 hours N d. 18 hours 3123: Which of the following statements is TRUE regarding automatic identification systems (AIS)?
N a. AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position and other safety related information to similarly equipped vessels, aircraft and shore stations within the area. N b. AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position and other safety related information to similarly equipped vessels, aircraft and shore stations within the area. Y c. AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position and other safety related information frequently to similarly equipped vessels, aircraft and shore stations within the area. N d. AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position and other safety related information to similarly equipped vessels, aircraft and shore stations within the area.