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.
52: You are downbound when you observe on your Mississippi River map a white square with a number inside located on either bank. This indicates __________.
Y a. a facilities display number N b. a river mile marker N c. a daybeacon N d. a river gage 77: You pass Morrison Towhead Light (mile 890.5 AHP) at 1723. What was your average speed since leaving Cairo?
N a. 8.8 mph Y b. 8.5 mph N c. 7.8 mph N d. 7.5 mph 103: You are approaching the Old River Control Structure (mile 314.5 AHP). The structure is in operation. Which of the following statements is TRUE?
N a. The maximum speeds permitted when passing the channel are 10 mph downbound and 7.5 mph upbound. N b. Tows must be no more than 110 feet wide when passing the inflow channel. Y c. You should navigate as close to the left descending bank of the Mississippi River as safety permits. N d. Tow length should not exceed 850 feet when passing the inflow channel. 115: After passing Wilkinson Lt. (mile 310.0 AHP) you see a flashing amber light on the right descending bank ahead. The flashing light indicates that you should __________.
N a. stay in the deepest water N b. slow down due to dredging operations N c. keep as close to the right descending bank as safety permits Y d. keep as close to the left descending bank as safety permits 267: At 0802, Branford Reef Light bears 348°T at 0.75 mile, and the north point of Falkner Island bears 088°T at 6.7 miles. What were the set and drift since 0740?
N a. Set 040°T, drift .2 knot N b. Set 220°T, drift .2 knot Y c. Set 220°T, drift .6 knot N d. You are making good your intended course and speed. 401: Your vessel receives a distress call from a vessel reporting her position as LAT 35°01'S, LONG 18°51'W. Your position is LAT 30°18'S, LONG 21°42'W. Determine the true course from your vessel to the vessel in distress by Mercator sailing.
N a. 135°T N b. 149°T Y c. 153°T N d. 160°T 414: A vessel at LAT 49°45'N, LONG 6°35'W, heads for a destination at LAT 25°50'N, LONG 77°00'W. Determine the true course and distance by Mercator sailing.
Y a. 246.5°T, 3597 miles N b. 253.0°T, 3648 miles N c. 268.6°T, 3483 miles N d. 066.4°T, 3602 miles 419: At 0900, you take the following radar ranges:
Watch Hill Point 5.4 miles
Block Island Grace Point 8.3 miles
Which statement about this fix is TRUE?
N a. You are to the left of the track line. N b. The bottom in the area is sand and gravel. N c. You are governed by the Inland Rules. Y d. The fix is indeterminate. 421: At 0345, you set a course to depart New London Harbor. Assuming no set and drift, which standard magnetic compass course must you steer to stay in the middle of the channel?
N a. 192°psc N b. 190°psc Y c. 187°psc N d. 175°psc 501: You depart from the position in the previous question at 2114 and make good 12 knots on a course of 040°T. At what time will you sight New Haven Light if the visibility is 11 miles?
N a. The light is visible at 2114. N b. 2152 Y c. 2159 N d. 2206 638: What is the mile point of the Fulton Gage?
Y a. 778 AHP N b. 687 AHP N c. 632 AHP N d. 598 AHP 673: You estimate the current at 2.0 mph. What is the speed over the ground?
N a. 3.5 mph N b. 4.5 mph Y c. 5.5 mph N d. 9.5 mph 729: On 24 September , your 1841 zone time DR position is LONG 129°34.5'E. At that time you observe Polaris with a sextant altitude (hs) of 25°20.8'. The chronometer time of the sight is 09h 38m 12s, and the chronometer error is 03m 12s slow. The index error is 4.3' off the arc, and the height of eye is 52 feet (15.9 meters). What is your latitude by Polaris?
N a. 24°28.1'N N b. 25°16.0'N Y c. 25°37.6'N N d. 25°42.3'N 745: On 13 October , at 1847 ZT, your vessel's DR position is LAT 42°17.4'N, LONG 138°46.2'W. At approximately this time, you obtain a sextant altitude (hs) of Polaris reading 42°16.8', with an index error of 3.2' on the arc. Your chronometer reads 03h 45m 20s and is 1m 32s slow. What is your latitude by Polaris, given a height of eye of 44 feet?
Y a. 42°09.1'N N b. 42°12.5'N N c. 42°16.0'N N d. 42°19.5'N 818: On 30 December , in DR position LAT 28°24.0'S, LONG 32°15.0'W, you take an ex-meridian observation of the Sun's lower limb. The chronometer time of the sight is 02h 09m 16s, and the chronometer error is 00m 00s. The sextant altitude (hs) is 84°03.3'. The index error is 3.5' off the arc, and your height of eye is 62.0 feet. What is the latitude at meridian transit?
N a. LAT 28°50.6'S Y b. LAT 28°51.9'S N c. LAT 28°54.2'S N d. LAT 28°56.6'S 1252: On 13 August , your 0345 ZT DR position is LAT 21°35.0'
N, LONG 135°26.0'W. You are on course 052°T at a speed of 14 knots. What will be the zone time of sunrise at your vessel?
N a. 0443 N b. 0449 Y c. 0536 N d. 0540 1256: On 17 May , your 0300 ZT DR position is LAT 27°21.0'N,
LONG 146°14.0'E. You are on course 107°T at a speed of 18 knots. What will be the zone time of sunrise at your vessel?
N a. 0457 N b. 0511 N c. 0519 Y d. 0522 1680: On 31 October , your 1700 zone time DR position is LAT 27°17.0'N, LONG 116°10.0'W, when an amplitude of the Sun is observed. The Sun's center is on the visible horizon and bears 246.5° per standard magnetic compass. Variation in the area is 8.5°E. The chronometer reads 01h 01m 23s and the chronometer error is 01m 54s slow. What is the deviation of the standard compass?
N a. 0.8°E Y b. 0.8°W N c. 2.5°E N d. 2.5°W 1726: The highest point on your towboat is 57 feet above water. The Natchez Gage (mile 363.3 AHP) reads 16.7 feet. What is the vertical clearance when you pass under the Natchez - Vidalia (westbound) Hwy. Bridge?
Y a. 52.3 feet N b. 59.9 feet N c. 61.0 feet N d. 68.6 feet 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 2281: You observe the lower limb of the Sun at a sextant altitude (hs) of 62°22.2' on 6 June . The index error is 1.2' on the arc. The height of eye is 28 feet (8.5 meters). What is the observed altitude (Ho)?
N a. 62°24.8' N b. 62°26.9' Y c. 62°31.4' N d. 62°36.7' 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 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 2694: While on a course of 152°T, a light bears 9° on the port bow at a distance of 11.6 miles. What course should you steer to pass 3 miles abeam of the light leaving it to port?
N a. 153° Y b. 158° N c. 163° N d. 167° 2695: You are underway on course 017°T at a speed of 14.2 knots.
You sight a buoy bearing 025°T at a radar range of 3.7 miles at 1947. If you change course at 1953, what is the course to steer to leave the buoy abeam to starboard at 0.1 mile?
N a. 021°T N b. 024°T Y c. 027°T N d. 030°T 3058: The propeller on a vessel has a diameter of 20.9 feet and a pitch of 19.6 feet. What would be the apparent slip if the vessel cruised 447 miles in a 23 hour day (observed distance) at an average RPM of 108?
N a. -5.6% N b. +5.6% N c. -7.0% Y d. +7.0% 3074: If the speed necessary for reaching port at a designated time is 19.2 knots and the pitch of the propeller is 22.7 feet, how many revolutions per minute will the shaft have to turn, assuming a 4% positive slip?
N a. 82 Y b. 89 N c. 96 N d. 103 3651: The true course between two points is 337°. Your gyrocompass has an error of 3°E and you make an allowance of 5° leeway for a west wind. Which gyro course should be steered to make the true course good?
Y a. 329°pgc N b. 335°pgc N c. 339°pgc N d. 345°pgc 3763: Your vessel is proceeding up 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 178°T, and the variation is 9°W. If the heading of your vessel at the time of the sighting is 180° per standard magnetic compass, what is the deviation?
N a. 2°E N b. 2°W Y c. 7°E N d. 7°W 4004: 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 166°.
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. 2.0°W Y b. 1.5°W N c. 1.0°W N d. 0.5°W 4004: 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 166°.
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. 2.0°W Y b. 1.5°W N c. 1.0°W N d. 0.5°W 10607: At 0912 your GPS position is LAT 41°04.9'N, LONG 72°42.1'W. You are on course 085° per standard magnetic compass at a speed of 6 knots. At 1052 your GPS position is 0.5 mile due south of Twenty-Eight Foot Shoal Lighted Buoy "TE". What were your set and drift?
N a. 145°T at 1.2 knots N b. 148°T at 0.9 knot N c. 320°T at 1.3 knots Y d. 325°T at 0.7 knot 11009: What best describes the structure from which Stratford Point Light is shown?
N a. Brown conical tower with white horizontal band in center of light on black pier N b. Red conical tower on brown cylindrical pier N c. White octagonal house on brown cylindrical pier Y d. White conical tower, with brown band midway of height 11010: What is the maximum speed permitted in Clinton Harbor?
Y a. 6 mph N b. 8 mph N c. 10 mph N d. 12 mph 11012: Which statement is FALSE with regard to Plum Island Harbor West Dolphin Light?
N a. The light is maintained from sundown to 0130 daily. Y b. The light is white. N c. The light is maintained by the U.S. Dept. of Agriculture. N d. The light is located on a dolphin. 13305: What are the bottom characteristics of Nautilus Shoal (LAT 37°03'N, LONG 75°56'W)?
N a. Sand and shells N b. Hard sand Y c. Fine gray sand N d. Mud and sand 13508: The bottom approximately three miles to the ESE of Block Island Southeast Point has __________.
Y a. gravel N b. shale N c. stones N d. grit 15467: At 1018, you are entering York Spit Channel and buoy "19" is abeam to starboard. At 1031, buoy "23" is abeam. What speed are you making good?
N a. 8.4 knots Y b. 8.8 knots N c. 9.7 knots N d. 9.9 knots 15516: If you were to head into Fishers Island Sound, which of the following charts would you switch to for better detail of Mystic and Mystic Harbor?
N a. 13209 N b. 13212 N c. 13213 Y d. 13214 15567: Point Judith Harbor of Refuge __________.
N a. is used mostly by towing vessels N b. has a maximum depth of 14 feet (4.3 meters) at MHW N c. West Gap has a controlling depth of 24 feet Y d. is entered through the East Gap or the West Gap 15612: At 1920, Cape Henry Light bears 225°pgc, and Chesapeake Channel Tunnel North Light bears 288°pgc. If your heading is 268°T, what is the relative bearing of Chesapeake Light?
N a. 194° N b. 205° Y c. 213° N d. 220° 15628: 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?
Y a. 58.0 feet N b. 64.1 feet N c. 72.5 feet N d. 78.6 feet 15839: From your 2000 position you change course to 206°T. What time would you expect to be abeam of Hog Island Buoy "12"?
N a. 2021 Y b. 2026 N c. 2031 N d. 2040 15861: At 0125, Mattituck Inlet Light bears 203°pgc at 2.1 miles.
What is the approximate depth of the water under the keel?
N a. 46 fathoms (83.6 meters) N b. 44 fathoms (80.0 meters) N c. 43 feet (13.0 meters) Y d. 38 feet (11.5 meters) 15866: What is your ETA at a point where Stratford Shoal Middle Ground Light bears 180°T if you make good 9.0 knots?
N a. 0409 Y b. 0416 N c. 0425 N d. 0433 16010: The characteristic of Branford Reef Light is __________.
N a. flashing red every 4 seconds N b. flashing red every 3 seconds Y c. flashing white every 6 seconds N d. flashing yellow every 4 seconds 16209: You calculate that the current will be ebbing at the Race at 0700. You should expect to be set in which general direction at the Race?
N a. West N b. North N c. Northeast Y d. East 16541: At 2255 you take the following visual bearings.
Saybrook Breakwater Light 333°pgc
Little Gull Island Light 094°pgc
Horton Point Light 211°pgc
What is your position?
Y a. LAT 41°13.6'N, LONG 72°19.2'W N b. LAT 41°13.8'N, LONG 72°19.6'W N c. LAT 41°14.0'N, LONG 72°19.0'W N d. LAT 41°14.2'N, LONG 72°19.7'W 16642: Based on your 0500 fix, which statement is TRUE?
N a. You are seaward of the 120 fathom curve. N b. The course made good between 0445 and 0500 was 345°T. Y c. You should alter course to port to clear Southwest Ledge Shoal. N d. A radar contact bearing 020°T at 4.8 miles is buoy "2A".