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.
56: The Red River Landing Gage reads 5.2 feet. The Low Water Reference Plane for the Red River is 10.6 ft. Which of the following statements is TRUE?
N a. The depth over revetment at Old River is 25.2 feet. Y b. River level is below the Low Water Reference Plane. N c. The depth over Old River Lock sill is greater than 11 ft. N d. This gage reading is at a higher elevation than the same reading on the Gage at Head of Passes. 191: If you make good 12 knots, what is the ETA at North Chesapeake Channel Entrance Buoy "NCA" (LL #375)?
N a. 2121 N b. 2116 Y c. 2111 N d. 2101 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 247: What type of bottom is found at Long Sand Shoal?
N a. Rocky N b. Muddy Y c. Hard N d. Sandy 306: A vessel steams 640 miles on course 047°T from LAT 34°45'N, LONG 140°00'E. What are the latitude and longitude of the point of arrival by mid-latitude sailing?
N a. LAT 41°57'N, LONG 150°02'E Y b. LAT 42°01'N, LONG 149°57'E N c. LAT 42°06'N, LONG 149°53'E N d. LAT 42°09'N, LONG 149°50'E 382: You arrive at Cape Charles City at 1700 and depart at 1800. You are underway in Chesapeake Bay and encounter heavy fog. At 1830, you obtain the following radar information:
Old Plantation Flats Light bearing 041.5° true @ 1.9 nm
What is your 1830 position?
N a. LAT 37°10.3'N, LONG 76°04.5'W N b. LAT 37°10.3'N, LONG 76°06.5'W N c. LAT 37°12.3'N, LONG 76°06.5'W Y d. LAT 37°12.3'N, LONG 76°04.4'W 395: A vessel at LAT 45°36.0'N, LONG 11°36.0'W, heads for a destination at LAT 24°16.0'N, LONG 73°52.0'W. Determine the true course and distance by Mercator sailing.
Y a. 247°T, 3299.3 miles N b. 247°T, 3951.6 miles N c. 251°T, 3298.5 miles N d. 251°T, 3951.6 miles 445: You can follow what loran reading between your two positions?
N a. There is no loran reading to follow. N b. 9960-Y-43958 Y c. 9960-X-25982 N d. 9960-W-14655 448: At 2100, you set course of 000°T, speed 10 knots from LAT 41°07.0'N, LONG 71°30.0'W. Visibility is 5.5 n.m. What is the earliest time you can expect to sight Point Judith Light? (Use charted range of 20 miles as nominal range.)
N a. The light is visible at 2100. N b. 2106 Y c. 2111 N d. 2123 542: You observe the planet Saturn at a sextant altitude (hs) of 63°05.1' on 25 May . The index error is 4.5' off the arc. The height of eye is 62 feet. What is the observed altitude (Ho)?
N a. 63°00.6' Y b. 63°01.5' N c. 63°02.9' N d. 63°04.1' 559: At 0615, Stratford Point Light bears 292°pgc, Falkner Island Light bears 052°pgc, and Branford Reef Light bears 018°pgc. What was the current since 0530?
N a. 083° at 0.9 knots Y b. 083° at 1.2 knots N c. 263° at 1.2 knots N d. 263° at 0.9 knots 651: You are planning a voyage by great circle from Reykjavik (LAT 63°30'N, LONG 24°00'W) to the Azores (LAT 39°30'N, LONG 29°00'W). Which statement is TRUE? (Use gnomonic tracking chart WOXZC 5274)
N a. The distance is measured in sixty-mile segments based on the length of a degree of latitude at the mid-latitude and mid-longitude position. N b. The Northern Hemisphere vertex lies south of Reykjavik. Y c. The great circle track is not appreciably shorter than a rhumb line track. N d. When plotted on a Mercator chart, the great circle track will be convex to the British Isles. 827: On 16 November , your 1200 ZT DR position is LAT 26°48.0'S, LONG 124°32.0'W. Your vessel is on course 078°T, speed 17.0 knots. You observe an ex-meridian of the Sun's lower limb. The sextant (hs) reads 81°41.3'. The index error is 1.5' off the arc, and your height of eye is 56 feet. The chronometer time of the observation is 08h 15m 32s, and the chronometer is 03m 06s fast. What is your latitude at meridian transit?
Y a. 26°42.6'S N b. 26°47.1'S N c. 26°49.5'S N d. 26°52.3'S 987: On 17 January , your 0730 zone time fix gives you a position of LAT 22°26.0'S, LONG 152°17.0'E. Your vessel is steaming on a course of 116°T at a speed of 17 knots. An observation of the Sun's lower limb is made at 1015 zone time. The chronometer reads 00h 13m 23s, and the chronometer error is 01m 49s slow. The observed altitude (Ho) is 66°02.1'. LAN occurs at 1152 zone time and a meridian altitude of the Sun's lower limb is made. The observed altitude (Ho) is 87°54.2'. Determine the vessel's 1200 zone time position.
Y a. LAT 22°53.8'S, LONG 153°25.6'E N b. LAT 22°53.8'S, LONG 153°28.8'E N c. LAT 22°56.3'S, LONG 153°25.6'E N d. LAT 22°56.3'S, LONG 153°28.8'E 1146: The Linwood Bend revetment on the LMR extends from mile __________.
N a. 828.1-823.1 RDB N b. 831.7-829.4 RDB N c. 845.4-842.5 LDB Y d. 841.3-838.7 LDB 1365: You estimate the current as 2.5 mph. What is the speed over the ground?
N a. 11.0 mph N b. 8.0 mph Y c. 6.0 mph N d. 5.5 mph 1701: The latest available information on the channel conditions above Baton Rouge that includes the latest buoy information, as well as recommended courses, is found in the __________.
N a. Corps. of Engineers maps N b. Waterways Journal Y c. Local Notice to Mariners N d. Sailing Directions 1720: As you approach mile 427.6 AHP, you see on the right side a white buoy with orange bands and open face diamond. This buoy shows __________.
N a. safe water N b. preferred channel Y c. danger N d. special marks 2013: On 28 October , morning twilight will occur around 0524 ZT in LAT 25°25.0'N, LONG 32°33.3'W. Considering their magnitude and location, which group will be the three stars best suited to observe for a star fix at star time?
N a. Sirius, Hamal, Denebola N b. Sirius, Denebola, Dubhe Y c. Sirius, Capella, Denebola N d. Sirius, Mirfak, Hamal 2021: On 29 April , your 0300 ZT DR position is LAT 28°39'N, LONG 168°03'E. You are on course 108°T at a speed of 22 knots. Considering their magnitude, azimuth, and altitude, which group includes the three bodies best suited for a fix at star time?
Y a. Moon, Alpheratz, Polaris N b. Deneb, Dubhe, Zubenelgenubi N c. Venus, Polaris, Arcturus N d. Moon, Altair, Sabik 2023: On 1 October , you determine the zone time of evening twilight will be 1835. Your DR position at this time is LAT 27°18.0'N, LONG 48°52.0'W. Considering their magnitude and location, which group of three stars are best suited to be used in obtaining a fix at star time?
N a. Altair, Rasalhague, Vega Y b. Alphecca, Kochab, Deneb N c. Diphda, Hamal, Mirfak N d. Antares, Rigil Kentaurus, Peacock 2168: On 22 July , at 0448 ZT, morning stars were observed, and the vessel's position was determined to be LAT 21°43.0'N, LONG 158°39.0'E. Your vessel is steaming at 21.0 knots on a course of 028°T. A sextant observation of the Sun's lower limb is made at 0956 ZT. The chronometer reads 10h 54m 27s, and the sextant altitude is 54°28.2'. The index error is 1.5' off the arc, and the chronometer error is 01m 38s slow. Your height of eye on the bridge is 56 feet. What is the azimuth (Zn) of this sight using the assumed position?
N a. 080.9°T N b. 082.2°T N c. 084.2°T Y d. 086.9°T 2205: What are the dimensions of Old River Lock, on the Lower Mississippi River?
N a. 1202 feet x 84 feet Y b. 1190 feet x 75 feet N c. 760 feet x 75 feet N d. 425 feet x 75 feet 2276: You observe the lower limb of the Sun at a sextant altitude (hs) of 46°20.3' on 1 April . The index error is 4.5' off the arc. The height of eye is 57 feet (17.4 meters). What is the observed altitude (Ho)?
N a. 46°24.2' N b. 46°27.9' N c. 46°30.1' Y d. 46°32.6' 2665: You are on course 079°T, speed 11.2 knots. At 0904 you see a daymark bearing 078°T at a range of 4.6. If you change course at 0910 to leave the daymark abeam to starboard at 0.5 mile, at what time will the daymark be abeam?
N a. 0918 N b. 0923 Y c. 0928 N d. 0935 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 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. 2860: Your vessel is on a course of 144°T at 16 knots. At 0126 a light bears 166.5°T, and at 0152 the light bears 189°T.
At what time and at what distance off will your vessel be when abeam of the light?
N a. 0205, 4.1 miles Y b. 0210, 4.8 miles N c. 0215, 6.0 miles N d. 0220, 6.4 miles 3073: If the speed necessary for reaching port at a designated time is 16.8 knots and the pitch of the propeller is 22.3 feet, how many revolutions per minute will the shaft have to turn, assuming a 4% negative slip?
N a. 61 N b. 66 Y c. 73 N d. 80 3269: Your vessel arrives in port with sufficient fuel to steam 812 miles at 15 knots. If you are unable to take on bunkers, at what speed must you proceed to reach your next port, 928 miles distant?
N a. 13.6 knots Y b. 14.0 knots N c. 15.3 knots N d. 15.7 knots 3302: You have steamed 132 miles and consumed 14.0 tons of fuel. If you maintain the same speed, how many tons of fuel will you consume while steaming 289 miles?
N a. 21.6 tons N b. 24.5 tons N c. 27.9 tons Y d. 30.7 tons 3318: While steaming at 12 knots, your vessel burns 45 tons of fuel per day. What will be the rate of fuel consumption if you decrease speed to 11.5 knots?
N a. 31 tons/day N b. 36 tons/day Y c. 40 tons/day N d. 43 tons/day 3465: You are underway on course 000°T at 9.5 knots. The current is 082°T at 1.1 knots. What is the course being made good?
Y a. 007°T N b. 009°T N c. 021°T N d. 353°T 3766: Your vessel is proceeding down a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this pair of lights is 229°T, and variation is 6°W. If the heading of your vessel at the time of the sighting is 232° per standard magnetic compass, what is the deviation?
Y a. 3°E N b. 9°E N c. 3°W N d. 9°W 3769: Entering a harbor, you take a bearing on a range and get 338° per gyrocompass (pgc). The true bearing from the chart is 340°T. Variation for the area is 14°E. Your course is 329° per standard magnetic compass (psc) and 338°pgc. The deviation on this heading is __________.
N a. 3°E Y b. 3°W N c. 5°E N d. 5°W 10300: Determine the course per standard magnetic compass from the entrance to Quonochontaug Pond (LAT 41°19.8'N, LONG 71°43.2'W) to the entrance to Great Salt Pond on Block Island.
N a. 129.5°psc N b. 134.0°psc N c. 156.0°psc Y d. 159.0°psc 11102: What is the velocity of the first PM (Daylight Savings Time) maximum ebb current at Plum Gut on 10 August 1983?
N a. 3.3 knots N b. 4.0 knots N c. 4.5 knots Y d. 5.4 knots 11811: What is the true course to steer between Horton Pt. Light and a position 2 miles due south of Branford Reef Light, if the set and drift of the current are 40°T at 1.5 knots, and an easterly wind will cause 3° of leeway? Your engines are making turns for 12 knots.
N a. 277°T N b. 283°T Y c. 287°T N d. 291°T 12507: You are on course 300° per standard magnetic compass (psc) when you take the following bearings: New Point Comfort Spit Light "2" 240°psc Horn Harbor Entrance Light HH 268°psc Wolf Trap Light 003°psc What is the position of the fix?
N a. LAT 37°20.8'N, LONG 76°09.6'W Y b. LAT 37°20.8'N, LONG 76°11.0'W N c. LAT 37°20.9'N, LONG 76°11.5'W N d. LAT 37°21.1'N, LONG 76°08.2'W 13400: You are going to anchor at Gardiners Bay in LAT 41°04.5'N, LONG 72°13.0'W. What type of bottom should you expect?
N a. Streaked mud N b. Sand N c. Hard rocks Y d. Soft mud 15146: At 0016 your position is 41°10.3'N, 71°53.0'W. You are steering a course of 296° true with no set and drift. At 0049 Race Rock Light is on your starboard beam. What was your speed made good from your 0016 position?
N a. 13.8 knots N b. 14.4 knots N c. 15.0 knots Y d. 15.6 knots 15646: At 2229 the gyro fails. What is the course to steer per standard magnetic compass to make good 206°T, if you allow 3° leeway for southeasterly winds?
N a. 187° N b. 191° Y c. 217° N d. 220° 15646: At 2229 the gyro fails. What is the course to steer per standard magnetic compass to make good 206°T, if you allow 3° leeway for southeasterly winds?
N a. 187° N b. 191° Y c. 217° N d. 220° 15706: At 0700, Stratford Shoal Middle Ground Light bears 137°
pgc. From your radar, you get a bearing of 007°pgc to the south tip of Stratford Point with a range of 4.5 miles. What is your 0700 position?
N a. LAT 41°04.6'N, LONG 73°07.0'W N b. LAT 41°04.6'N, LONG 73°07.4'W Y c. LAT 41°04.7'N, LONG 73°07.2'W N d. LAT 41°04.8'N, LONG 73°07.0'W 15720: The red sector of New London Harbor Light covers from __________.
N a. 040° - 310° Y b. 000° - 041° N c. 208° - 220° N d. 204° - 239° 15745: Your 2239 position is LAT 41°08.5'N, LONG 71°53.3'W. You change course to 315°T, and you maintain RPM's for 9 knots. At 2329 Little Gull Island Light bears 253°T, Race Rock Light bears 309°T, and Watch Hill Point Light bears 058°T. What were the set and drift of the current you experienced from your 2239 position?
N a. 076°T at 0.75 knot N b. 076°T at 0.90 knot N c. 256°T at 0.75 knot Y d. 256°T at 0.90 knot 15828: At 0305 on 18 April, you pass under the Greenville Bridge (mile 531.3 AHP). What was your average speed since departing Amoco Pipeline Co. Docks (mile 253.6 AHP)?
N a. 6.2 mph N b. 6.5 mph Y c. 6.8 mph N d. 7.2 mph 15916: If you correct for the current in the preceding question (215°T at 0.5 knot) and maintain an engine speed of 7.5 knots, what is your ETA 0.5 mile south of buoy "W"?
N a. 1016 N b. 1021 Y c. 1026 N d. 1030 16066: Which statement concerning Thimble Shoal Channel is TRUE?
Y a. The project width of the main channel is 1000 feet (30.3 meters) N b. The channel is 14.5 miles in length. N c. A tow drawing 30 feet (9.1 meters) is excluded from the main channel. N d. Thimble Shoal Channel is in international waters. 16464: At 0405, you increase speed. At 0500, your position is LAT 37°06.0'N, LONG 75°41.1'W. What is the approximate depth of the water under the keel?
N a. 66 feet (20.0 meters) N b. 62 feet (18.8 meters) N c. 54 feet (16.4 meters) Y d. 46 feet (13.9 meters) 16558: From your position you observe a rotating white and green light to the north. This light is most likely __________.
Y a. at an airport N b. on a naval mine-countermeasures vessel N c. "Block Island North Light" N d. on a vessel engaged in public safety activity