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. 71: The Natchez Gage reads 20.6 feet. The high point on your towboat is 47 feet above the water. What is the vertical clearance as you pass under the Natchez Highway Bridge?
N a. 78.6 feet N b. 72.5 feet N c. 64.1 feet Y d. 58.4 feet 170: You observe the lower limb of the Sun at a sextant altitude (hs) of 54°28.2' on 22 July . The index error is 1.5' off the arc. The height of eye is 56 feet (17.1 meters). What is the observed altitude (Ho)?
N a. 54°30.9' N b. 54°36.2' Y c. 54°37.7' N d. 54°37.9' 213: From your 1915 position, you come left and set a course for Gardiners Point. At 1930, your position is LAT 41°12.7'N, LONG 71°56.8'W. What type of bottom is charted at this position?
N a. Blue mud, gritty shells N b. Buried mussels, gritty shells N c. Bumpy muck with grainy surface Y d. Blue mud, gray sand 347: If you change course at 0420, what is the course to make good to leave Twenty Eight Foot Shoal Lighted Buoy abeam to port at 1 mile?
N a. 086°T Y b. 084°T N c. 082°T N d. 079°T 492: At 0748, you change course to 160°T. What loran reading can you follow to remain on this course?
N a. 9960-W-14660.0 Y b. 9960-W-14651.0 N c. 9960-Y-43943.8 N d. 9960-Y-43852.0 597: Which daymark will you see as you approach Natchez Beam Lt. (mile 364.8 AHP)?
N a. Red diamond N b. White square N c. Green square Y d. Red triangle 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 751: On 16 July , at 2000 zone time, you take a sextant observation of Polaris. Your vessel's DR position is LAT 27°22.0'N, LONG 148°35.0'W, and your sextant reads 26°57.5'. Your chronometer reads 05h 59m 16s, and your chronometer error is 01m 28s slow. Your height of eye is 48 feet, and the index error for your sextant is 1.3' off the arc. What is the latitude of your vessel from your observation of Polaris?
N a. 26°52.1'N N b. 26°58.8'N Y c. 27°36.1'N N d. 27°43.4'N 752: On 5 May , at 1953 zone time, you take a sextant observation of Polaris. Your vessel's DR position is LAT 29°30.0'N, LONG 66°25.7'W, and your sextant reads 29°07.2'. Your chronometer reads 11h 51m 45s, and your chronometer error is 01m 36s slow. Your height of eye is 56 feet, and the index error for your sextant is 1.5' on the arc. What is the latitude of your vessel from your observation of Polaris?
N a. 29°14.3'N Y b. 29°23.6'N N c. 29°32.3'N N d. 29°38.8'N 845: On 16 September , your 0600 ZT fix gives you a position of LAT 29°47.2'N, LONG 65°28.4'W. Your vessel is on course 242°T and your speed is 13.5 knots. Local apparent noon (LAN) occurs at 1227 ZT, at which time a meridian altitude of the Sun's lower limb is observed. The observed altitude (Ho) for this sight is 63°25.3'. What is the calculated latitude at LAN?
N a. 29°07.9'N N b. 29°06.1'N Y c. 29°04.7'N N d. 29°01.6'N 978: On 11 November , your 0730 zone time position was LAT 19°58.0'N, LONG 143°54.0'W. Your vessel was steaming on course 084°T at a speed of 15.0 knots. An observation of the Sun's lower limb was made at 0931 ZT. The chronometer read 07h 29m 22s and was slow 02m 22s. The observed altitude (Ho) was 44°17.6'. LAN occurred at 1125 zone time (ZD +10). The observed altitude (Ho) was 52°17.4'. What was the longitude of your 1200 zone time running fix?
N a. 142°34.7'W N b. 142°37.1'W Y c. 142°40.2'W N d. 142°44.2'W 1008: On 27 March , your 0730 zone time position is LAT 28°16'N, LONG 56°37'W. Your vessel is on course 158°T at a speed of 15.0 knots. An observation of the Sun's lower limb is made at 0915 zone time. The chronometer reads 01h 14m 11s, and the chronometer error is 00m 53s slow. The observed altitude (Ho) is 45°10.7'. LAN occurs at 1150 zone time, and a meridian altitude of the Sun's lower limb is made. The observed altitude (Ho) is 65°32.8'. Determine the vessel's 1200 zone time position.
Y a. LAT 27°08.8'N, LONG 56°04.2'W N b. LAT 27°08.8'N, LONG 56°10.3'W N c. LAT 27°11.6'N, LONG 56°04.2'W N d. LAT 27°11.6'N, LONG 56°10.3'W 1080: On 20 Feb. , your 0530 ZT DR position is LAT 24°15.0'N, LONG 137°33.0'W. You are on course 033°T at a speed of 18 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 0600 running fix. NP-0010
N a. LAT 24°23.3'N, LONG 137°35.5'W N b. LAT 24°26.0'N, LONG 137°25.8'W Y c. LAT 24°27.5'N, LONG 137°31.8'W N d. LAT 24°30.1'N, LONG 137°24.5'W 1091: On 10 August , your 0430 ZT position is LAT 29°56.7'S, LONG 139°11.0'E. Your course is 321°T, speed 18.2 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 0500 running fix. NP-0021
N a. LAT 29°46.0'S, LONG 138°54.0'E Y b. LAT 29°49.2'S, LONG 138°57.0'E N c. LAT 29°56.0'S, LONG 139°03.8'E N d. LAT 30°07.5'S, LONG 138°55.2'E 1179: On 26 September , your 0830 zone time DR position is LAT 26°04.0'N, LONG 129°16.0'W. Your vessel is on course 119°T at a speed of 20.0 knots. What is the zone time of local apparent noon (LAN)?
Y a. 1124 N b. 1127 N c. 1130 N d. 1133 1661: On 11 May , in DR position LAT 28°13.7'N, LONG 168°36.3'E, you observe an amplitude of the Sun. The Sun's center is on the celestial horizon and bears 283°psc. The chronometer reads 07h 13m 19s and is 02m 56s slow. Variation in the area is 13°E. What is the deviation of the standard magnetic compass?
N a. 5.2°W Y b. 5.6°W N c. 7.4°E N d. 7.8°E 1705: What is the mile point of the Rosedale, MS Gage?
N a. 554.2 AHP Y b. 592.2 AHP N c. 632.5 AHP N d. 663.0 AHP 1767: What is the vertical clearance of the Natchez-Vidalia Highway Bridge when the Natchez-Vidalia Highway Bridge Gage reads 23.4 feet?
Y a. 102.6 ft N b. 108.3 ft N c. 119.5 ft N d. 125.6 ft 1857: On 22 May , your 0437 ZT DR position is LAT 25°18.5'N, LONG 51°18.0'W. You observe an unidentified star bearing 097°T at an observed altitude (Ho) of 48°20.0'. The chronometer reads 07h 40m 40s and is 03m 24s fast. What star did you observe?
Y a. Markab N b. Diphda N c. Sabik N d. Hamal 1866: On 12 June , your 1845 DR position is LAT 21°47'N, LONG 46°52'W when you observe a faint unidentifiable star through a break in the clouds. The star bears 019.0°T at a sextant altitude (hs) of 53°56.2'. The index error is 0.5' on the arc, and the height of eye is 45 feet. The chronometer reads 09h 43m 27s, and the chronometer error is 1m 46s slow. What star did you observe?
N a. Phecda N b. Mimosa N c. Gamma Ursae Minoris Y d. Mizar 1875: On 2 October , your 1845 DR position is LAT 28°09.2'S, LONG 167°48.1'E. You observe a faint star through a hole in the clouds at a sextant altitude (hs) of 68°03.6' bearing 154°T. The index error is 1.3' off the arc, and the height of eye is 42 feet. The chronometer reads 07h 46m 19s and is 0m 51s fast. What star did you observe?
Y a. Alpha Indi N b. Epsilon Cygni N c. Gamma Aquilae N d. Albireo 1899: On 22 May , your 0437 DR position is LAT 25°18.5'N, LONG 51°18.0'W. You observe an unidentified star bearing 116°T at an observed altitude (Ho) of 11°27.8'. The chronometer reads 07h 40m 40s, and is 03m 24s fast. What star did you observe?
N a. Markab Y b. Diphda N c. Sabik N d. Hamal 1904: On 22 March , your 0519 DR position is LAT 27°20.6'N, LONG 69°25.6'W. You observe an unidentified star bearing 115°T at an observed altitude (Ho) of 54°52.8'. The chronometer reads 10h 16m 47s, and is 02m 15s slow. What star did you observe?
Y a. Altair N b. Enif N c. Menkar N d. Rigel 1909: On 22 March , your 1834 DR position is LAT 26°13.5'S, LONG 108°36.5'W. You observe an unidentified star bearing 294°T at an observed altitude (Ho) of 33°02.7'. The chronometer reads 01h 32m 37s, and is 01m 50s slow. What star did you observe?
N a. Regulus Y b. Menkar N c. Rigel N d. Alphard 2090: At your current speed of 17 knots you only have enough fuel remaining to travel 316 miles. You must travel 622 miles to reach your destination. What should you reduce your speed (knots) to in order to reach your destination?
Y a. 12.1 N b. 13.3 N c. 14.5 N d. 15.7 2182: On 18 August , at 0600 ZT, morning stars were observed, and the vessel's position was determined to be LAT 19°48'N, LONG 108° 34'W. Your vessel is steaming on course 166°T at a speed of 16 knots. An observation of the Sun's lower limb is made at 1036 ZT. The chronometer reads 05h 34m 48s and is slow 01m 24s. What is the computed altitude (Hc) and azimuth (Zn) for this 1036 ZT observation using the assumed position method?
N a. Hc 65°18.5', Zn 102.1° Y b. Hc 65°14.8', Zn 100.4° N c. Hc 65°11.3', Zn 099.4° N d. Hc 65°07.2', Zn 101.2° 2278: You observe the lower limb of the Sun at a sextant altitude (hs) of 31°31.5' on 6 March . The index error is 2.5' on the arc. The height of eye is 76 feet. What is the observed altitude (Ho)?
Y a. 31°35.3' N b. 31°36.7' N c. 31°38.2' N d. 31°39.5' 2287: You observe the lower limb of the Sun at a sextant altitude (hs) of 34°51.4' on 18 October . The index error is 2.0' off the arc. The height of eye is 54 feet (16.5 meters). What is the observed altitude (Ho)?
Y a. 35°01.2' N b. 35°03.6' N c. 35°05.2' N d. 35°07.4' 2321: At 2350 on 23 June, you are at mile 610.5 AHP when you see about a mile ahead lights on the water near the left bank. What might you see when you come abreast of these lights?
N a. Privately maintained buoys at a yacht club N b. Government buoys marking the Hurricane Point dikes Y c. Barges moored at the Dennis Landing Terminal N d. A pipeline discharging dredge spoil 2404: At 0812, you are on course 132°T. The standard magnetic compass reads 135°. What should you conclude?
N a. The deviation table is correct for that heading. Y b. Your compass may be influenced by a local magnetic disturbance. N c. You should adjust the magnetic compass. N d. The deviation is increasing as you go south. 2684: You are steering 173°T, and a light is picked up dead ahead at a distance of 13.9 miles at 0054. You change course to pass the light 4.5 miles off abeam to port. If you are making 21 knots, what is your ETA at the position 4.5 miles off the light?
N a. 0122 N b. 0125 Y c. 0131 N d. 0134 3107: You are turning 68 RPM, with a propeller pitch of 18 feet, and an estimated slip of +2%. What is the speed of advance?
N a. 10.7 knots N b. 11.5 knots Y c. 11.8 knots N d. 12.3 knots 3772: Your ship is entering port from sea, and you sight a pair of range lights. When in line, they bear 315° per standard magnetic compass. The chart shows that the range bearing is 312°T, and that variation is 6°W. What is the deviation of your compass at the time of the sighting?
Y a. 3°E N b. 3°W N c. 9°E N d. 9°W 10301: Determine the course per standard magnetic compass from Cerberus Shoal Buoy 9 (LAT 41°10.4'N, LONG 71°57.1'W) to the entrance to Quonochontaug Pond (LAT 41°19.8'N, LONG 71°43.2'W).
N a. 030°psc N b. 036°psc Y c. 059°psc N d. 067°psc 10901: The area around Cape Charles is _______________ .
Y a. low and bare, but the land back of it is high and wooded N b. composed of low to medium rolling hills N c. well defined with rocky outcroppings N d. marked by high, barren hills 10904: What is the distance from Chesapeake Bay entrance to Baltimore?
Y a. 150 nm N b. 162 nm N c. 173 nm N d. 247 nm 11801: What course should you steer by standard magnetic compass (psc) between Horton Pt. Light and Falkner Island Light, if the set and drift of the current are 040°T at 0.9 knot, and a westerly wind will cause 2° of leeway? Your engines are making turns for 10 knots.
Y a. 314.0°psc N b. 319.0°psc N c. 324.5°psc N d. 328.5°psc 12207: You sight Stratford Pt. Light in line with the Igor I. Sikorsky Airport Aero Beacon bearing 319° per standard magnetic compass. What is the compass deviation?
Y a. 4°W N b. 4°E N c. 18°W N d. 18°E 12900: Your 1302 position is LAT 37°14.7'N, LONG 76°22.7'W. You are turning for 9.6 knots. What is your ETA at Trestle C of the Chesapeake Bay Bridge and Tunnel if you follow York River Entrance Channel?
N a. 1516 Y b. 1505 N c. 1500 N d. 1451 12905: At 0919 you are in Chesapeake Channel between Trestle B and Trestle C of the Chesapeake Bay Bridge and Tunnel. What is your ETA to a point between York Spit Channel Buoys "35" and "36" if you are making 11.3 knots and follow the buoyed channel?
N a. 1025 N b. 1028 N c. 1033 Y d. 1037 13506: The broken magenta lines starting at Montauk Point and running generally ENE to Block Island indicate __________.
N a. recommended tracks to Block Island Y b. a submerged cable area N c. a military exercise area N d. demarcation lines for application of the COLREGS 15029: What type of daymark will you see as you approach Gold Dust Bar Light (mile 793.3 AHP) ?
Y a. Red diamond N b. Red triangle N c. Green square N d. Green diamond 15046: As you pass through the Chesapeake Bay Bridge and Tunnel,
you take a bearing of 047°pgc along trestle C when it is in line. The helmsman reports the vessel's heading as 316°
pgc and 329°psc. What is the deviation on that heading?
N a. 3°E N b. 1°E Y c. 1°W N d. 9°W 15412: Determine your 1915 position using the following information obtained at 1915.
Visual bearings
Cape Charles Light 107°pgc
Cape Henry Light 172°pgc
Radar Bearing and Range
Chesapeake Channel Tunnel South Light 189°pgc at 7.2 miles
N a. LAT 37°03.5'N, LONG 76°05.9'W N b. LAT 37°03.5'N, LONG 76°09.3'W N c. LAT 37°05.9'N, LONG 76°03.5'W Y d. LAT 37°09.3'N, LONG 76°03.1'W 15416: At 2200, you are in position LAT 36°57.5'N, LONG 76°02.5'W. You intend to travel up the Thimble Shoals auxiliary Channel to Hampton Roads. According to the Coast Pilot,
what is the depth of the auxiliary channel on either side of the main channel?
N a. 28 feet (8.5 meters) Y b. 32 feet (9.8 meters) N c. 36 feet (11.0 meters) N d. 45 feet (13.7 meters) 15760: As you near Little Gull Island, you use your loran to insure that you do not come within 0.5 mile of the island. Which loran reading will act as a danger line and keep you off Little Gull Island by a minimum of 0.5 mile?
N a. Not more than 9960-W-14735.9 N b. Not more than 9960-X-26149.0 N c. Not less than 9960-X-26140.0 Y d. Not less than 9960-Y-43953.5 15811: At 0100, you obtain the following bearings:
Rocky Point Lookout Tower 062°T
Horton Point Lighthouse 189°T
What was the speed made good between 0045 and 0100?
Y a. 7.4 knots N b. 8.0 knots N c. 8.7 knots N d. 9.2 knots 15843: You continue to steer 195°T. You pass Cape Charles Lighted Bell Buoy "14", 0.9 miles abeam to starboard at 2111. Your speed made good from 2045 to 2111 is __________.
N a. 13.7 knots N b. 14.1 knots N c. 14.5 knots Y d. 14.8 knots 15860: At 0100, your position is LAT 41°05.3 N, LONG 72°29.2 W. You head for the position one mile north of Mattituck Inlet Light and turn to make good 9.0 knots. If the visibility is about 2 miles, at what approximate time will you sight the light?
N a. The light is visible at 0100 N b. 0109 Y c. 0120 N d. 0128 16038: At 0820 Old Field Point Light bears 206° per gyrocompass,
and Stratford Shoals Middle Ground Light bears 322° per gyrocompass. The radar range to Middle Ground Light is 1.5 miles. Your 0820 fix gives you a position of __________.
N a. LAT 41°02.6'N, LONG 73°05.2'W Y b. LAT 41°02.5'N, LONG 73°04.9'W N c. LAT 41°02.3'N, LONG 73°05.2'W N d. LAT 41°02.0'N, LONG 73°05.1'W 16266: The abandoned lighthouse at Cape Henry is a(n) __________.
N a. octagonal, black and white tower N b. radio beacon station N c. emergency back up to Cape Henry Light Y d. gray, pyramidal tower 16542: At 2308 your position is LAT 41°12.7'N, LONG 72°22.8'W.
You steer a course to make good 255°T from this position. At 2310 you receive a distress call from a vessel anchored 2.1 miles due north of Mattituck Inlet Light. If you change course at 2314, what is the course to steer per gyrocompass to arrive at the distress site if you allow 2°
leeway for northerly winds, 3°E gyro error and correct your course for a current of 073°T at 1.3 knots?
N a. 208°pgc N b. 212°pgc N c. 216°pgc Y d. 220°pgc 16612: At 0112, what is the approximate depth under the keel?
Y a. 38 feet (11.5 meters) N b. 47 feet (14.2 meters) N c. 51 feet (15.5 meters) N d. 57 feet (17.3 meters) 16710: In clear weather, how far away will you sight Point Judith Light? (use charted range of 20 miles as nominal range)
N a. 9.2 nm N b. 10.6 nm N c. 12.3 nm Y d. 14.0 nm 16717: At 0705, you take the following bearings:
Watch Hill Light 030.5°pgc
Latimer Reef Light 329.0°pgc
Race Rock Light 262.0°pgc
What was the true course made good between 0645 and 0705?
N a. 252°T Y b. 256°T N c. 263°T N d. 266°T