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.
147: After passing Oak Bend Lt. (mile 425.6 AHP) you see a light gray shaded area extending into the river shown on the map. This indicates a __________.
N a. fleeting area N b. weir N c. dike Y d. revetment 198: While navigating inbound Thimble Shoal Channel system you must __________.
N a. navigate in the main channel when between Trestles A & B Y b. use the north auxiliary channel N c. remain 1500 yards (1360 meters) from large naval vessels N d. maintain a speed of six knots 209: At 0705, you take the following bearings:
Watch Hill Light 034.5°pgc
Latimer Reef Light 338.0°pgc
Race Rock Light 268.0°pgc
What was the true course made good between 0645 and 0705?
Y a. 253°T N b. 256°T N c. 263°T N d. 266°T 259: The south coast of Long Island Sound between Mattituck Inlet and Port Jefferson is __________.
N a. composed of high rocky bluffs N b. a high, flat plateau with sheer cliffs N c. low and marshy with isolated beaches Y d. fringed by rocky shoals 316: From your 1830 fix, you continue south on a course of 150°T turning RPMs for 6 knots. You encounter a flood current in the direction of 330°T at 2 knots. Adjusting your course for set and drift, which course would you steer to make good a course of 150°T while turning RPMs for 6 knots?
N a. 162°T N b. 158°T Y c. 150°T N d. 144°T 351: At 0430, you change course and speed to make good 090°T at 10 knots. At 0433, you slow due to an engineering casualty and estimate you are making good 5.5 knots. At what time will Branford Reef Light bear 000°T?
N a. 0624 N b. 0620 Y c. 0609 N d. 0601 573: Visibility has decreased to 1 mile in haze. At 0948, you take the following radar ranges. What course should you steer from this fix to the York Spit channel between buoys "19" and "20"?
Thimble Shoal Light - 5.9 miles South end of trestle C of the Chesapeake Bay Bridge and Tunnel - 3.8 miles South end of trestle B of the Chesapeake Bay Bridge and Tunnel - 5.4 miles
Y a. 010°pgc N b. 008°pgc N c. 004°pgc N d. 001°pgc 680: On which voyage would a great circle track provide a significant savings in distance to steam, when compared to a rhumb line track? (Use gnomonic tracking chart WOXZC 5270.)
N a. Valdez, AK, to the Marquesas Islands (LAT 8°00'S, LONG 140°00'W) N b. San Francisco to Kodiak, AK N c. Christmas Island (LAT 2°00'N, LONG 157°30'W) to Singapore via LAT 3°00'N, LONG 126°00'E Y d. Guam (LAT 14°00'N, LONG 145°00'E) to Seattle via LAT 47°30'N, LONG 125°30'W 682: As you pass under the Natchez-Vidalia Dual Bridge, the gage on the bridge reads 8.9 ft. If the highest point on your vessel is 54 ft. above the water, what is your vertical clearance?
N a. 60.0 feet Y b. 63.1 feet N c. 67.2 feet N d. 122.0 feet 832: On 19 November , in DR position LAT 20°03.5'N, LONG 129°48.0'W, you take an ex-meridian observation of the planet Venus at upper transit. The chronometer time of the sight is 11h 29m 44s, and the chronometer error is 01m 23s slow. The sextant altitude (hs) is 43°54.3'. The index error is 2.0' off the arc, and your height of eye is 48 feet. What is the latitude at meridian transit?
N a. 20°08.2'N Y b. 19°58.0'N N c. 19°53.2'N N d. 19°50.6'N 989: On 2 April , your 0830 zone time fix gives you a position of LAT 20°16.0'S, LONG 004°12.0'E. Your vessel is steaming a course of 143°T at a speed of 18.0 knots. An observation of the Sun's upper limb is made at 0903 zone time, and the observed altitude (Ho) is 42°39.6'. The chronometer reads 09h 05m 40s, and the chronometer error is 02m 15s fast. Local apparent noon occurs at 1145 zone time,
and a meridian altitude of the Sun's lower limb is made.
The observed altitude (Ho) for this sight is 63°46.2'.
Determine the vessel's 1200 zone time position.
N a. LAT 21°10.1'S, LONG 004°53.9'E N b. LAT 21°14.0'S, LONG 004°55.0'E Y c. LAT 21°18.0'S, LONG 005°00.5'E N d. LAT 22°42.0'S, LONG 004°57.0'E 1142: At 1132, 24 May, you pass Natchez Beam Lt. (mile 364.8 AHP). What is your ETA off the Memphis Gage if you average 8.0 mph?
N a. 2345, 25 May Y b. 0947, 26 May N c. 1525, 26 May N d. 2215, 26 May 1197: On 16 November , your 0800 ZT DR position is LAT 25°11.0'N, LONG 117°41.0'W. Your vessel is on a course of 252°T at a speed of 14.5 knots. What is the ZT of local apparent noon (LAN)?
N a. 1135 Y b. 1139 N c. 1143 N d. 1146 1415: The highest point on your towboat is 52 feet above the water, and the Helena Gage reads +9.6 feet. What will be the vertical clearance when you pass under the A-span of the Helena Highway Bridge?
N a. 49.8 feet N b. 53.9 feet Y c. 57.8 feet N d. 73.1 feet 1467: On 17 April , your 1610 ZT DR position is LAT 22°07.0'N, LONG 158°16.0'W. At that time, you observe the Sun bearing 271°psc. The chronometer reads 03h 08m 52s, and the chronometer error is 01m 16s slow. The variation is 4°E. What is the deviation of the standard magnetic compass?
N a. 1.1°W N b. 1.7°E Y c. 2.3°W N d. 2.9°E 1673: On 17 April , your vessel's position is LAT 21°00'S, LONG 78°30'W, when an amplitude of the Sun is observed. The Sun's center is on the celestial horizon and bears 082.7° per standard magnetic compass. Variation in the area is 2.0°W. The chronometer reads 10h 59m 24s and is 01m 24s fast. What is the deviation of the compass?
Y a. 2.0°W N b. 3.0°W N c. 2.5°E N d. 3.0°E 1687: What are the light characteristics of Greenwood Light (mile 288.6 AHP).
N a. Fixed red light N b. 1 red flash every 4 seconds Y c. 2 red flashes every 5 seconds N d. 2 white flashes every 4 seconds 1711: What is the length of the trip?
N a. 722.0 miles N b. 953.8 miles Y c. 1097.9 miles N d. 1332.1 miles 1851: On 23 September , while taking stars for an evening fix, an unidentified star is observed bearing 261°T at an observed altitude of 61°35'. Your 1836 zone time DR position is LAT 25°18'S, LONG 162°36'E. The chronometer reads 07h 34m 12s, and the chronometer error is 01m 54s slow. Your vessel is steaming on a course of 230°T at a speed of 18 knots. What star did you observe?
Y a. Antares N b. Canopus N c. Achernar N d. Sirius 1896: On 22 June , your 0424 DR position is LAT 26°18.5'N, LONG 124°18.2'W. You observe an unidentified star bearing 154°T at an observed altitude (Ho) of 15°01.2'. The chronometer reads 12h 23m 24s, and is 01m 32s slow. What star did you observe?
N a. Peacock N b. Schedar Y c. Ankaa N d. Alioth 1918: On 14 January , your 1922 DR position is LAT 27°18.5'S, LONG 67°18.0'E. You observe an unidentified star bearing 295°T at an observed altitude (Ho) of 13°50.7'. The chronometer reads 03h 25m 43s, and is 03m 15s fast. What star did you observe?
N a. Elnath N b. Fomalhaut N c. Pollux Y d. Markab 1924: On 23 September , your 1836 DR position is LAT 25°18'S, LONG 162°23'E. You observe an unidentified star bearing 000°T at an observed altitude (Ho) of 26°18'. The chronometer reads 07h 34m 12s, and is 01m 54s slow. What star did you observe?
N a. Antares N b. Canopus N c. Achernar Y d. Vega 1928: On 17 March , your 0520 DR position is LAT 27°23.0'N, LONG 39°42.0'W. At this time you observe an unidentified star bearing 270°T with an observed altitude of 46°30.2'. The chronometer reads 08h 22m 15s, and is 01m 45s fast. What star did you observe?
N a. Altair N b. Alkaid Y c. Arcturus N d. Deneb 2160: On 17 April , your vessel's 1856 zone time DR position is LAT 22°35.0'N, LONG 63°15.0'W. At that time, a sextant observation of the star Sirius is made. The sextant altitude is 42°45.0' and the chronometer reads 10h 59m 27s.
The index error is 2.6' off the arc, and the chronometer error is 03m 01s fast. Your height of eye is determined to be 45 feet. What is the computed altitude (hc) and azimuth (Zn) for this sight using the assumed position?
N a. 42°40.0', 214.9°T N b. 42°40.0', 325.1°T Y c. 42°51.6', 214.9°T N d. 42°51.6', 325.1°T 2206: What is the distance in river miles, from the new mouth of the White River to the RR and Hwy bridge at Baton Rouge, LA?
N a. 338 miles Y b. 365 miles N c. 400 miles N d. 454 miles 2327: After you enter Thimble Shoal Channel, you will alter course to pass between Trestle "A" and "B". Based upon your present position, passing buoy "12" to port, what is TRUE?
N a. You are required to proceed outbound in the North Auxiliary Channel to avoid ferry traffic N b. You may proceed outbound in Thimble Shoal Channel Y c. You should cross the main channel and proceed outbound in the South Auxiliary Channel N d. Water depth is 38 feet. 2676: While on a course of 019°pgc, a light bears 14° on the port bow at a distance of 15.3 miles. What course should you steer to pass 1.5 miles abeam of the light, leaving it to port?
N a. 006°pgc Y b. 011°pgc N c. 013°pgc N d. 015°pgc 2690: While on a course of 066°pgc, a light bears 13° on the port bow at a distance of 12.3 miles. What course should you steer to pass 4 miles abeam of the light leaving it to port?
N a. 067°pgc Y b. 072°pgc N c. 079°pgc N d. 085°pgc 2718: What organization has an installation at the uppermost end of Carthage Revetment?
N a. City of Natchez (waterfront) Y b. River Cement Co. N c. J.M. Jones Lumber N d. International Paper Co. 2719: If the Gage at the Greenville Highway Bridge reads 22.0 feet, and the low water reference plane (LWRP) for Greenville (Bridge). MS is 11.3 feet. What is the water level in relation to the low water reference plane?
N a. 22.1 feet below the LWRP N b. 10.7 feet below the LWRP Y c. 10.7 feet above the LWRP N d. 0.5 feet below the LWRP 2911: What is indicated by the two light gray shaded areas that cross the river above False River Lt. (mile 251.0 AHP)?
N a. Ferry crossings Y b. Utility crossings N c. Aerial cable crossings N d. Bridge construction 3067: From 1020, 3 March, to 1845, 5 March, your vessel steamed an observed distance of 845.6 miles. The average RPM was 78, and the pitch of the propeller was 20'03". What was the slip?
N a. -4% Y b. +4% N c. -8% N d. +8% 3285: While steaming at 19.4 knots, your vessel consumes 392 barrels of fuel oil per day. In order to reduce consumption to 182 barrels of fuel oil per day, what is the maximum speed the vessel can turn for?
N a. 13.2 knots Y b. 15.0 knots N c. 17.4 knots N d. 18.2 knots 3627: Your vessel is steering course 243°psc. Variation for the area is 5°E, and deviation is 2°W. The wind is from the south-southeast, producing a 2° leeway. What true course are you making good?
N a. 242°T N b. 244°T N c. 246°T Y d. 248°T 3755: Your vessel is proceeding up a channel, and you see a pair of range lights that are in line ahead. The chart indicates that the direction of this pair of lights is 186°T, and the variation is 11°W. If the heading of your vessel at the time of the sighting is 193° per standard magnetic compass, what is the correct deviation?
Y a. 4°E N b. 4°W N c. 7°E N d. 7°W 10900: The abandoned lighthouse west of Cape Henry Light is __________.
N a. painted black and white N b. a low mound of rubble Y c. a gray, pyramidal structure N d. a steel skeleton structure 11109: What is the velocity of the maximum ebb current approximately 1.1 miles ENE of Little Gull Island in the afternoon of 25 April 1983?
Y a. 5.5 knots N b. 4.7 knots N c. 4.2 knots N d. 1.3 knots 13302: The shoal spanned by Trestle B of the Chesapeake Bay Bridge and Tunnel is __________.
N a. Chesapeake shoal N b. the Middle ground N c. Lynnhaven roads Y d. the Tail of the Horseshoe 15061: Falkner Island Light is shown __________.
N a. 46 feet (13.9 meters) above sea level N b. only from 1 June to 10 October Y c. from a white octagonal tower N d. with a six-second period 15139: At what time would you expect to be abeam of Buoy "MP"?
N a. 2240 N b. 2244 Y c. 2248 N d. 2252 15561: At what time will you cross the 60 foot curve if you make good 12 knots?
Y a. 0527 N b. 0534 N c. 0541 N d. 0544 15615: At 2000, your position is LAT 37°04.1'N, LONG 76°05.6'W. You change course for the Eastern Shore. At 2037, Old Plantation Flats Light bears 033°pgc, and York Spit Light bears 282°pgc. The course made good from your 2000 position is __________.
Y a. 359°T N b. 006°T N c. 014°T N d. 020°T 16220: At 0930, your position is LAT 41°16.5'N, LONG 71°41.4'W,
and you are turning for 7 knots. Allowing 3° leeway for southerly winds and estimating the current as 035° at 0.3
knot, what is the course to steer (pgc) to point "B"?
N a. 089°pgc N b. 091°pgc N c. 093°pgc Y d. 096°pgc 16264: Which statement about your 0400 position is true?
N a. You are governed by the Inland Rules of the Road. N b. Anchoring, trawling and fishing are prohibited. N c. The ocean floor is composed of shingle. Y d. You are within the Territorial Sea and the contiguous zone. 16270: The wind is northerly and will cause 2° leeway. The current is 018° at 0.5 knot. If your engines are turning for 8.0 knots. What should you steer to remain in York River Entrance Channel?
N a. 304°T N b. 306°T Y c. 309°T N d. 314°T 16409: At 0337, fog closes in and you anchor under the following radar ranges and bearing.
South tip of Watch Hill Point 3.0 miles
East point of Fishers Island 1.4 miles
Latimer Reef Light 331°T
What is the approximate depth of water at your anchorage?
N a. 83 feet (25.2 meters) Y b. 100 feet (30.3 meters) N c. 120 feet (36.4 meters) N d. 135 feet (40.9 meters) 16620: You sight Bartlett Reef Light in line with New London Harbor Light bearing 043°pgc. You are heading 088°pgc and 098.5° per standard magnetic compass at the time of the observation. Which statement is TRUE?
N a. The true heading at the observation was 090°. Y b. The deviation is 1.5°E by observation. N c. The magnetic compass error is 9.5°W. N d. The gyro error is 2°E.