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.
15: The Vicksburg Gage reads 31.9 feet. The high point on your towboat is 43 feet above the water. What is the vertical clearance as you pass under the Vicksburg Highway 80 Bridge?
N a. 36.2 feet Y b. 41.4 feet N c. 58.0 feet N d. 84.3 feet 39: At 1227, on 19 October, you pass under the Greenville Highway Bridge (mile 531.3 AHP). What speed must you average to arrive at Jimmy Hawken Light (mile 663.5 AHP) at 0930 the following day?
Y a. 6.3 mph N b. 5.9 mph N c. 5.6 mph N d. 5.2 mph 92: A stretch where the channel changes from one side of the river to the other is called a __________.
Y a. crossing N b. transit N c. transfer N d. passing 149: Your engines are turning for 8.2 mph. You estimate the current at 1.5 mph. What is your speed over the ground?
Y a. 9.7 mph N b. 8.8 mph N c. 8.2 mph N d. 6.7 mph 159: You are turning for 6.8 mph and estimate the current at 1.0 mph. What is your speed over the ground?
N a. 8.8 mph N b. 8.2 mph Y c. 7.8 mph N d. 6.8 mph 163: Which light will you be passing at 0059, on 22 September, if you make good 9.2 mph?
N a. Kate Aubrey Lt. Y b. Obion Bar Lt. N c. Trotter Lt. N d. Quaker Oats Lt. 268: What publication contains information on the navigational hazards in the vicinity of Falkner Island?
N a. The navigational regulations in Title 46, Code of Federal Regulations Y b. U.S. Coast Pilot N c. U.S. Coast Guard Light List N d. Inland Navigation Rules 291: What is the height above water of Davis Creek Channel Light "1"?
Y a. 15 feet (4.6 meters) N b. 17 feet (5.2 meters) N c. 19 feet (5.8 meters) N d. 24 feet (7.3 meters) 415: A vessel at LAT 33°45'N, LONG 118°30'W, heads for a destination at LAT 21°15'N, LONG 157°36'W. Determine the true course and distance by Mercator sailing.
N a. 109.8°T, 2196 miles N b. 236.3°T, 2259 miles Y c. 250.2°T, 2216 miles N d. 289.2°T, 2413 miles 454: Determine the great circle distance and initial course from LAT 26°00.0'S, LONG 56°00.0'W to LAT 34°00.0'S, LONG 18°15.0'E.
N a. 3705 miles, 153°T N b. 3841 miles, 068°T N c. 3849 miles, 248°T Y d. 3805 miles, 117°T 528: You depart LAT 38°12'S, LONG 12°06'W and steam 1543 miles on course 270°. What is the Longitude of arrival?
Y a. 44°49'W N b. 45°12'W N c. 45°37'W N d. 45°42'W 540: Determine the distance from LAT 34°18'S, LONG 172°40'E to LAT 34°18'S, LONG 152°38'E, by parallel sailing.
Y a. 993.0 miles N b. 995.2 miles N c. 996.4 miles N d. 998.6 miles 554: Based on your running fix, you __________.
Y a. have a following current N b. have a head current N c. are being set to the north N d. are not affected by a current 576: What is indicated by the dashed magenta line crossing York Spit Channel between buoys "20" and "22"?
N a. You are crossing the demarcation line between the COLREGS and the Inland Rules. N b. The line indicates a submarine cable, and you should not anchor in the area. Y c. The line marks the limits of a regulated area. N d. It marks the range between Ft. Wool Light and Cape Charles Harbor Range, Rear Light. 599: Which town is located at mile 663.5 AHP?
Y a. Helena N b. Friers Point N c. St. Francis N d. Rodney 642: Where can scheduled broadcast times of river stages be found?
N a. Sailing Directions Y b. Light List N c. List of Lights N d. Coast Pilot 740: On 14 March , your 1846 ZT DR position is LAT 21°57.6'N, LONG 132°16.2'W. At that time you observe Polaris with a sextant altitude (hs) of 22°16.8'. The chronometer time of the sight is 03h 45m 10s, and the chronometer error is 01m 32s slow. The index error is 3.2' off the arc, and the height of eye is 44.9 feet. What is your latitude by Polaris?
N a. 21°32.4'N Y b. 21°49.8'N N c. 21°51.0'N N d. 21°53.1'N 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 1213: It is 23 November and you are keeping zone time +4. You are on course 262°T, speed 21 knots. Your 0800 DR position is LAT 24°30.0'N, LONG 48°40.0'W. What is the time of the second estimate of LAN by ship's clocks?
Y a. 11h 05m 54s N b. 11h 34m 22s N c. 12h 06m 02s N d. 12h 08m 36s 1301: As you approach Casting Yard Dock Lt. (mile 265.4 AHP) you notice on the map a circle with 2 black sectors. This symbol indicates a __________.
N a. lock N b. warning sign Y c. river gage N d. mooring buoy 1890: On 22 July , your 1759 DR position is LAT 24°50.2'S, LONG 05°16.0'E. You observe an unidentified star bearing 100°T at an observed altitude (Ho) of 61°48.2'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?
N a. Regulus Y b. Antares N c. Miaplacidus N d. Suhail 1953: You are downbound when you observe on your Mississippi River map a circel with black and white quadrants on the left bank. This indicates a __________.
Y a. river gage N b. daymark N c. control tower N d. information board 2024: On 3 December , evening twilight for your vessel will occur at 1901 zone time. Your vessel's DR position for this time will be LAT 24°18.5'S, LONG 110°30.6'W. Considering their magnitude and location, what are the three stars best suited to observe for a fix at star time?
N a. Canopus, Hamal, Deneb Y b. Alpheratz, Achernar, Nunki N c. Antares, Fomalhaut, Mirfak N d. Rigel, Canopus, Regulus 2025: On 10 October , your 1500 zone time DR position is LAT 27°35.6'S, LONG 44°49.0'W. You are on course 342°T at a speed of 24 knots. Considering their magnitude, azimuth, and altitude, which group includes the three bodies best suited for a fix at star time?
N a. Venus, Moon, Fomalhaut N b. Venus, Arcturus, Hamal Y c. Moon, Al Na'ir, Rigil Kentaurus N d. Deneb, Spica, Markab 2122: At 1538 ZT, on 15 October , in DR LAT position LAT 18° 12.8' S, LONG 160° 48.4' E, you observe an amplitude of the Moon. The center of the Moon is on the visible horizon and bears 276.2°psc. Variation is 10° E. What is the deviation?
N a. 2.6°E N b. 2.6°W N c. 3.6°E Y d. 3.6°W 2157: On 25 May , your vessel's 1917 zone time position is LAT 24°16.0'N, LONG 017°26.0'W. At that time a sextant observation of the planet Saturn was made. The sextant altitude is 63°05.1', and the chronometer reads 08h 18m 24s. The index error is 4.5' off the arc, and the chronometer error is 01m 05s fast. Your height of eye is determined to be 62.0 feet. What is the azimuth (Zn) of this sight using the assumed position?
N a. 143.8° Y b. 147.3° N c. 148.7° N d. 149.9° 2172: On 11 October , at 0516 ZT, morning stars were observed, and the vessel's position was determined to be LAT 23°21.0'N, LONG 139°27.0'W. Your vessel is steaming at 14.0 knots on a course of 293°T. A sextant observation of the Sun's lower limb is made at 0927 ZT. The chronometer reads 06h 30m 21s, and the sextant altitude (hs) is 39°48.7'. The index error is 2.0' on the arc, and the chronometer error is 02m 56s fast. Your height of eye on the bridge is 63.0 feet. What is the azimuth (Zn) of this sight using the assumed position?
N a. 116.2°T Y b. 123.4°T N c. 126.2°T N d. 128.4°T 2326: The Coast Guard announces that Chesapeake Channel is closed indefinitely due to a collision in the channel between Trestle "B" and "C" of the Chesapeake Bay Bridge and Tunnel. You exit York Spit Channel, leaving buoy "22"
close abeam to port at 0.1 mile, and alter course to leave Horseshoe Crossing Lighted Bell Buoy "HC" abeam to port at 0.2 mile. What is the course per gyrocompass?
Y a. 185°pgc N b. 188°pgc N c. 191°pgc N d. 194°pgc 2329: You sighted Trestle "B" in line at 0706 and are steering 108°T. At 0731, Cape Henry Light bears 136°T; Cape Charles Light bears 032.5°T; and Thimble Shoal Tunnel South Light bears 282°T. What was the speed made good between 0706 and 0731?
Y a. 8.3 knots N b. 8.8 knots N c. 9.2 knots N d. 9.4 knots 2403: At 0812 you obtain the following information:
Chesapeake Light bearing 091° true @ a range of 10.5 nm
What is your 0812 position?
N a. LAT 36°53.7'N, LONG 75°56.0'W N b. LAT 36°53.8'N, LONG 75°56.1'W Y c. LAT 36°54.4'N, LONG 75°55.9'W N d. LAT 36°54.6'N, LONG 75°55.8'W 2588: At 2130 New Haven buoy "NH" bears 337° per gyro compass and Middle Ground Lt bears 254° per gyro compass. You must arrive 0.3 miles off Port Jefferson buoy "PJ" at 2300. What speed will you have to make good, for arrival at 2300?
N a. 9.0 knots Y b. 9.3 knots N c. 9.6 knots N d. 10.7 knots 2588: At 2130 New Haven buoy "NH" bears 337° per gyro compass and Middle Ground Lt bears 254° per gyro compass. You must arrive 0.3 miles off Port Jefferson buoy "PJ" at 2300. What speed will you have to make good, for arrival at 2300?
N a. 9.0 knots Y b. 9.3 knots N c. 9.6 knots N d. 10.7 knots 2666: You are on course 086°T, speed 11.7 knots. At 1013 you see a buoy bearing 088°T at a range of 4.8 miles. If you change course at 1019 to leave the buoy abeam to port at 1.0 mile, at what time will the buoy be abeam?
Y a. 1037 N b. 1040 N c. 1043 N d. 1052 3300: You have steamed 156 miles and consumed 19 tons of fuel. If you maintain the same speed, how many tons of fuel will you consume while steaming 273 miles?
N a. 23.6 tons N b. 27.9 tons Y c. 33.3 tons N d. 37.2 tons 4016: You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a magnetic compass heading of 004°.
HEADING HEADING HEADING
PSC PGC PSC PGC PSC PGC
358.5° - 354° 122.5° - 114° 239.5° - 234°
030.5° - 024° 152.0° - 144° 269.0° - 264°
061.5° - 054° 181.0° - 174° 298.0° - 294°
092.0° - 084° 210.0° - 204° 327.5° - 324°
N a. 1.5°W N b. 0.5°W N c. 0.0° Y d. 1.0°E 10302: Determine the course per standard magnetic compass from Cerberus Shoal Buoy 9 (LAT 41°10.4'N, LONG 71°57.1'W) to a position 0.2 mile south of Race Rock Light (LAT 41°14.6'N, LONG 72°02.8'W).
Y a. 326.5°psc N b. 324.0°psc N c. 298.5°psc N d. 296.0°psc 10602: At 1815 your GPS position is LAT 41°09.2'N, LONG 72°36.9'W. You are steering course 285° per standard magnetic compass at a speed of 16 knots. At 1909 you fix your position by plotting several compass bearings on nearby known fixed objects. These result in a position of LAT 41°08.5'N, LONG 72°53.7'W. What were your set and drift?
N a. 292°T at 1.8 knots N b. 243°T at 1.0 knot N c. 118°T at 1.9 knots Y d. 111°T at 2.1 knots 12105: While in the Back River, you sight the two tanks along the Northwest Branch (vicinity LAT 37°05.6'N, LONG 76°22.0'W) in line bearing 274°psc. If your vessel is heading 300°psc, what is TRUE?
Y a. There is no deviation. N b. The deviation is equal to the variation. N c. The deviation is 9°E. N d. The deviation is 0° only for a bearing of 274°psc. 12601: You are on course 062° per standard magnetic compass when you take the following bearings: Branford Reef Light 060°psc Stratford Point Light 272°psc New Haven Light 324°psc What is your position?
N a. LAT 41°07.1'N, LONG 72°53.4'W Y b. LAT 41°10.5'N, LONG 72°52.8'W N c. LAT 41°11.6'N, LONG 72°50.0'W N d. LAT 41°13.3'N, LONG 72°48.7'W 13109: At 1113 you are in the entrance to Great Salt Pond on Block Island with buoy "5" close aboard. What is your ETA at light "1" at the mouth of the approaches to Lake Montauk if you make good 9.6 knots?
N a. 1310 Y b. 1301 N c. 1254 N d. 1249 15158: At 1630, you reach point "A" and come right to 204°T. Your engine speed is 12 knots. Your 1715 position is LAT 37°09.8'N, LONG 75°37.4'W. The current was __________.
N a. 067°T at 1.1 knots Y b. 067°T at 1.5 knots N c. 247°T at 1.1 knots N d. 247°T at 1.6 knots 15160: At 1815, your position is LAT 37°01.0'N, LONG 75°42.7'W. If there is no current, what is the course per standard magnetic compass to arrive at a point 0.3 mile due north of North Chesapeake Entrance Lighted Whistle Buoy "NCA"?
N a. 249.0°psc N b. 251.5°psc N c. 255.0°psc Y d. 257.0°psc 15209: At 1800, Tue Marshes Light bears 264.5°pgc, York Spit Swash Channel Light "3" bears 007°pgc. Your position is __________.
N a. LAT 37°15.5'N, LONG 76°19.8'W N b. LAT 37°15.2'N, LONG 76°20.3'W N c. LAT 37°15.0'N, LONG 76°20.0'W Y d. LAT 37°14.5'N, LONG 76°20.1'W 15363: At 0530, you change course to 090°T and increase speed to 8.5 knots. What is the course to steer per gyro compass if northerly winds are causing 2° of leeway?
N a. 088°pgc Y b. 090°pgc N c. 092°pgc N d. 094°pgc 15511: From your 1830 fix, you come left to a course of 290°T.
Which of the following statements concerning Watch Hill Light is FALSE?
N a. The nominal range of its white light is 15 miles. N b. It displays both red and white lights. N c. Its horn blasts every 30 seconds in fog. Y d. Its geographic range is 18.5 miles at a 35 foot (10.7 meter) height of eye. 15770: 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 northerly winds and estimating the current as 035° at 0.3 knot, what is the course to steer (pgc) to point "B"?
N a. 084°pgc Y b. 086°pgc N c. 091°pgc N d. 094°pgc 15965: If the visibility is 5 miles, what is the luminous range of New Point Comfort Spit Light "4"?
N a. 0.5 mile Y b. 3.4 miles N c. 4.8 miles N d. 5.0 miles 16059: At 1800, Tue Marshes Light bears 270°pgc, and York Spit Swash Channel Light "3" bears 007°pgc. Your position is __________.
N a. LAT 37°14.0'N, LONG 76°19.8'W N b. LAT 37°14.2'N, LONG 76°20.3'W Y c. LAT 37°14.2'N, LONG 76°20.1'W N d. LAT 37°14.5'N, LONG 76°20.0'W 16144: From your 2027 position you change course to 106°T, while maintaining an engine speed of 18 knots. Your ETA at a position where Block Island Sound South Entrance Obstruction Lighted Buoy "BIS" is abeam is __________.
N a. 2039 N b. 2043 N c. 2047 Y d. 2050 16258: What is the course to steer per standard magnetic compass from the anchorage to point A, if easterly winds are causing 3° of leeway?
N a. 187° Y b. 191° N c. 194° N d. 197° 16340: If you make good your intended course and speed, at what time will you cross the 150-foot curve?
N a. 2237 N b. 2249 Y c. 2256 N d. 2301 16644: Visibility becomes variable in patchy fog and you maintain 5 knots speed. At 0610 you sight Montauk Point Light bearing 239°pgc, and at 0630 you sight Watch Hill Point Light bearing 333°pgc. What is the position of your 0630 running fix?
Y a. LAT 41°08.3'N, LONG 71°45.4'W N b. LAT 41°08.2'N, LONG 71°45.8'W N c. LAT 41°08.1'N, LONG 71°45.1'W N d. LAT 41°08.0'N, LONG 71°45.2'W 16746: In order to check your compasses, you sight Race Rock Light in line with New London Harbor Light bearing 336° per gyrocompass. The helmsman reports the vessel was heading 275.0°pgc and 290.5° per standard magnetic compass at the time of the observation. Which statement is TRUE?
N a. The gyro error is now 2°E. Y b. The deviation table is correct for that heading. N c. The vessel should be swung to check the deviation table. N d. The compass error is 0.5°W.