USCG Navigation Problems: Master's License

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.


59: You pass Warnicott Bar Lt. at 1146, 24 May. What is your ETA off the Mhoon Landing Gage if you average 6.5 mph?


182: What course should you steer using the standard magnetic compass (psc) to make good the course of 192°pgc?


228: Your height of eye is 25 feet (7.6 meters). If the visibility is 5.5 nautical miles, what is the luminous range of Wolf Trap Light?


239: What do the dotted lines around Goose Island and Kimberly Reef represent?

    Y a. Depth contours
    N b. Breakers
    N c. Limiting danger
    N d. Tide rips

243: From your 1210 position, you are making good a course of 083°T. Your engines are turning RPMs for 10 knots. The set and drift of the current are 310° at 1.7 knots. At what time should you expect to enter the red sector of New London Harbor Light?

    Y a. 1243
    N b. 1254
    N c. 1259
    N d. 1305

324: The mean high water level at Old Point Comfort is __________.

    N a. 3.3 feet (1.1 meters)
    Y b. 2.6 feet (0.8 meters)
    N c. 1.2 feet (0.4 meters)
    N d. 0.0

486: What is your speed from your 0630 position, with Buoy "PI" close abeam, to your 0654 position?

    N a. 11.4 knots
    Y b. 10.5 knots
    N c. 9.3 knots
    N d. 8.2 knots

543: What was the current between 0520 and 0600?

    N a. 201° at 1.0 knot
    N b. 201° at 1.5 knot
    Y c. 021° at 1.5 knot
    N d. 021° at 1.0 knots

558: 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. 094°pgc
    N b. 092°pgc
    Y c. 090°pgc
    N d. 088°pgc

563: At 0705, the gyro loses power. At 0715, you are on course 092° per standard magnetic compass (psc) when you take the following bearings: Falkner Light bears 356°psc, Horton Point Light bears 123°psc, and Kelsey Point Breakwater Light bears 048°psc. What is the position of your 0715 fix?

    N a. LAT 41°06.7'N, LONG 72°36.0'W
    Y b. LAT 41°07.0'N, LONG 72°36.2'W
    N c. LAT 41°07.2'N, LONG 72°36.4'W
    N d. LAT 41°07.4'N, LONG 72°36.4'W

624: You are on a voyage from San Diego, CA, to New York, NY. The distance from pilot to pilot is 4860 miles. The speed of advance is 15.0 knots. You estimate 18 hours for bunkering at Colon, and 14 hours for the Panama Canal transit. If you take departure at 0836 hours (ZD +7), 4 July, what is your ETA (ZD +4) at New York?

    N a. 0336, 20 July
    N b. 0036, 19 July
    N c. 0336, 19 July
    Y d. 0736, 19 July

627: You are on a voyage from Halifax, Nova Scotia, to Galveston, TX. The distance is 2138 miles, and the speed of advance is 12.5 knots. You estimate 18.0 hours for bunkering enroute at Port Everglades, FL. If you sail at 0648 hours (ZD +4), 12 June, what is your ETA (ZD +5) at Galveston?

    Y a. 0250, 20 June
    N b. 0350, 20 June
    N c. 0550, 20 June
    N d. 1350, 20 June

630: You are on a voyage from Corpus Christi, TX, to Fort de France, Martinique. The distance from pilot to pilot is 2190 miles (2521 statute miles). The speed of advance is 15.0 knots. You estimate a layover in Charlotte Amalie, Virgin Islands, of 16.0 hours. If you take departure at 0654 (ZD +6), 27 November, what is your ETA (ZD +4) at Fort de France?

    N a. 2054, 3 December
    N b. 2254, 3 December
    Y c. 0254, 4 December
    N d. 2054, 4 December

806: On 15 November , your 0913 zone time fix gives you a position of LAT 22°30.0'N, LONG 68°28.0'W. Your vessel is on course 164°T, and your speed is 13.5 knots. Local apparent noon (LAN) occurs at 1118 zone time at which time meridian altitude of the Sun's lower limb is observed. The observed altitude (Ho) for this sight is 49°46.0'. What is the calculated latitude at LAN?

    N a. 21°36.1'N
    N b. 21°37.7'N
    Y c. 21°39.3'N
    N d. 21°40.9'N

820: On 15 March , in DR position LAT 21°42.0'N, LONG 55°26.0'W, you take an ex-meridian observation of the Sun's lower limb. The chronometer time of the sight is 04h 02m 40s, and the chronometer error is 02m 24s fast. The sextant altitude (hs) is 66°15.6'. The index error is 2.8' on the arc, and your height of eye is 56 feet. What is the latitude at meridian transit?

    N a. 21°12.0'N
    N b. 21°18.0'N
    N c. 21°24.4'N
    Y d. 21°32.0'N

844: On 12 September , your 0600 zone time (ZT) fix gives you a position of LAT 22°51.9'N, LONG 133°40.1'W. Your vessel is on course 062°T, and your speed is 12.3 knots. Local apparent noon (LAN) occurs at 1142 ZT, at which time a meridian altitude of the Sun's upper limb is observed. The observed altitude (Ho) for this sight is 70°33.2'. What is the calculated latitude at LAN?

    N a. 23°23.0'N
    Y b. 23°24.8'N
    N c. 23°26.5'N
    N d. 23°27.9'N

1148: You complete changing out your tow and get underway enroute Ark City Tank Storage (mile 554.0 AHP) to deliver the tank barges. What is the distance you must travel from Cairo Point Light?

    N a. 202.1 miles
    Y b. 400.7 miles
    N c. 554.2 miles
    N d. 605.8 miles

1211: It is 15 July and you are keeping +7 zone time. You are on course 095°, speed 16 knots. Your 0800 DR position is LAT 25°39.4'N, LONG 129°46.2'W. What is the time of the second estimate of LAN by ship's clocks?

    N a. 13h 40m 17s
    Y b. 13h 38m 26s
    N c. 12h 42m 20s
    N d. 12h 38m 20s

1261: On 16 February , your 0300 ZT DR position is LAT 28°32.0'S, LONG 176°49.0'E. You are on course 082°T at a speed of 21 knots. What will be the zone time of sunrise at your vessel?

    N a. 0534
    Y b. 0552
    N c. 0631
    N d. 0645

1297: At 0645, on the 17th of April, you pass Hole in the Wall Lt. (mile 373.4 AHP). What has been your average speed since departing the Exxon Refinery?

    N a. 8.8 mph
    N b. 7.3 mph
    N c. 6.8 mph
    Y d. 6.3 mph

1677: On 23 August , at 0604 ZT, in DR position LAT 16°42.3'S, LONG 28°19.3'W, you observed an amplitude of the Sun. The lower limb was a little above the horizon, and the Sun bore 076.0°pgc. At the time of the observation, the helmsman reported that he was heading 143°pgc and 167°
per standard magnetic compass. The variation in the area was 23°W. What were the gyro error and deviation for that heading?

    N a. 1°W GE, 2°W DEV
    N b. 1°E GE, 1°E DEV
    N c. 2°W GE, 1°E DEV
    Y d. 2°E GE, 1°E DEV

1725: As you pass Fort Adams (311.4 AHP) you observe a flashing amber light on the right descending bank ahead. This indicates that you should __________.

    N a. proceed with caution as there is construction work being done on the revetment
    N b. keep as close to the right descending bank as safety permits
    Y c. keep as close to the left descending bank as safety permits
    N d. proceed with caution as the river is congested around the bend

1832: Where can scheduled broadcast times of river stages be found?

    N a. Sailing Directions
    N b. List of Lights
    Y c. Light List
    N d. Coast Pilot

2202: After entering Milliken Bend (mile 455 AHP) you wish to locate the river service in Madison Parish, Louisiana. The river service is indicated by the square containing which number?

    N a. 5
    Y b. 4
    N c. 3
    N d. 2

2248: Which company does NOT have a marine facility in Rosedale Harbor (mile 585 AHP)?

    Y a. T.L. James
    N b. Rosedale-Boliver County Port Commission
    N c. Cives Steel Company
    N d. Sanders Elevator Corp

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.

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

2709: If the highest point of your towboat is 54 feet above the water and the Natchez Gage reads 24.8 feet, what will be your vertical clearance when passing under the Natchez-Vidalia westbound Highway Bridge?

    N a. 35.9 feet
    Y b. 47.2 feet
    N c. 49.6 feet
    N d. 57.5 feet

2874: Your vessel is on a course of 207°T at 13 knots. At 0539 a light bears 180.5°T, and at 0620 the light bears 162°T.
At what time and at what distance off will your vessel be when abeam of the light?

    N a. 0633, 5.9 miles
    N b. 0641, 6.5 miles
    N c. 0653, 7.6 miles
    Y d. 0701, 8.9 miles

2881: Your vessel is steering 049°T at 15 knots. At 1914 a light bears 078°T, and at 1951 the same light bears 116°T. What will be your distance off abeam?

    Y a. 6.7 miles
    N b. 7.1 miles
    N c. 7.5 miles
    N d. 8.3 miles

2890: You are steaming on a course of 084°T at a speed of 13 knots. At 1919 a lighthouse bears 106.5°T. At 1957 the same lighthouse bears 129°T. What will be your distance off the lighthouse when abeam?

    N a. 4.3 miles
    Y b. 5.7 miles
    N c. 7.1 miles
    N d. 8.2 miles

3639: You desire to make good a true course of 132°. The variation is 10°W, magnetic compass deviation is 5°E, and gyrocompass error is 5°W. A northeast by east wind produces a 5° leeway. What is the course to steer per standard magnetic compass to make the true course good?

    Y a. 132°psc
    N b. 135°psc
    N c. 137°psc
    N d. 142°psc

3641: You desire to make good a true course of 174°. The variation is 17°W, magnetic compass deviation is 4°W, and gyrocompass error is 4°E. A west-southwest wind produces a 4° leeway. What is the course to steer per standard magnetic compass to make the true course good?

    N a. 195°psc
    N b. 197°psc
    Y c. 199°psc
    N d. 203°psc

3645: The true course between two points is 119°. Your gyrocompass has an error of 3°E. You allow of 4° leeway for a south-southwest wind. What gyro course should be steered to make the true course good?

    N a. 112°pgc
    N b. 118°pgc
    Y c. 120°pgc
    N d. 126°pgc

11402: At 1018 your position is LAT 41°14.4'N, LONG 72°07.2'W. At 1036 your vessels position is LAT 41°13.1'N, LONG 72°16.1'W. What was your true course and speed made good?

    Y a. 259° at 22.6 knots
    N b. 245° at 23.1 knots
    N c. 079° at 22.8 knots
    N d. 065° at 25.5 knots

12210: You sight New Haven Outer Channel Range Rear Light in line with the Outer Channel Range Front Light bearing 343° per standard magnetic compass. What is your compass error?

    N a. 5°E
    N b. 5°W
    N c. 9°E
    Y d. 9°W

14002: At 1630 your vessel exits Bonneville Lock steaming in a westerly direction. What speed must you average to arrive at the Interstate 5 highway bridge with an ETA of 2120?

    N a. 6 mph
    N b. 7 mph
    Y c. 8 mph
    N d. 9 mph

15362: The south shore of Long Island Sound near your position is __________.

    N a. marked by gradual shoaling
    N b. low and marshy
    N c. backed by marshes and wooded uplands
    Y d. bluff and rocky

15429: What is the vertical clearance of the Vicksburg Highway 80 Bridge when the river level is the same as the Low Water Reference Plane? The low water reference plane (LWRP) for Vicksburg, MS. is 0.1.

    N a. 128.3 ft
    N b. 125.6 ft
    N c. 119.5 ft
    Y d. 116.1 ft

15608: 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
    N b. 246°T at 1.1 knots
    Y c. 067°T at 1.5 knots
    N d. 246°T at 1.5 knots

15622: What are the dimensions of the Old River Lock on the Lower Old River (304 AHP)?

    Y a. 1190 x 75 feet
    N b. 1195 x 75 feet
    N c. 1195 x 84 feet
    N d. 1202 x 84 feet

15642: At 2030 you take the following radar ranges:

Race Rock Light 2.1 miles
Latimer Reef Light 6.4 miles

If you estimate an average current of 080°T at 1.5 knots,
which course will you steer per gyrocompass to leave Endeavor Shoals Gong Buoy bearing 270°T at 1.5 miles?

    N a. 115°
    N b. 118°
    N c. 124°
    Y d. 127°

15768: At 0830, Watch Hill Point bears 343°T at 3.5 miles by radar. What was the speed made good since 0745?

    Y a. 7.1 knots
    N b. 6.7 knots
    N c. 5.8 knots
    N d. 5.4 knots

15809: At 0045, you obtain the following bearings:

Rocky Point lookout tower 072°T
Horton Point lighthouse 213°T

What were the set and drift between 0005 and 0045?

    N a. 272°true, 0.9 knot
    N b. 272°true, 1.4 knots
    N c. 092°true, 0.9 knot
    Y d. 092°True, 1.4 knots

15830: The black broken-line marking, across the river, that appears at mile 952.1 AHP represents a __________.

    Y a. utility crossing
    N b. railroad
    N c. submarine crossing
    N d. revetment

15870: What is the approximate distance from a point three miles south of Stratford Point to Perth Amboy, NJ?

    N a. 53 miles
    N b. 62 miles
    Y c. 73 miles
    N d. 136 miles

16107: If the visibility is 5 miles and you are in the red sector,
at what distance off should you sight Cape Henry Light?

    N a. 15 miles
    N b. 13 miles
    N c. 11 miles
    Y d. 09 miles

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

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°

16269: On either side of York River Entrance Channel, there are areas bounded by short - long magenta lines and marked by yellow buoys. These areas are __________.

    Y a. fish trap areas
    N b. designated anchorages
    N c. spoil areas
    N d. naval exercise areas

16515: What action should you take to compensate for the above current?

    N a. Continue on the same course and speed.
    Y b. Alter your course to the left.
    N c. Slow to 8.5 knots.
    N d. Alter your course to the right.

16606: Your position is LAT 40°59.0'N, LONG 73°06.2'W. What is the course per standard magnetic compass to New Haven Harbor Lighted Whistle Buoy "NH"?

    N a. 035°
    N b. 046°
    N c. 049°
    Y d. 052°

16610: At 2142, you change course to make good 030°T and increase speed to 14 knots. You rendezvous with another vessel and receive fresh supplies while off New Haven Harbor lighted whistle buoy "NH". What is the light characteristic of this buoy?

    N a. _ .
    N b. _ _
    Y c. . _
    N d. . .