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.

193: If the visibility is 3 miles, at what range will you lose sight of Chesapeake Light?
252: At 0100, you obtain the following radar ranges:

Inlet Point - 2.7 miles,
Rocky Point - 4.5 miles,
Horton Point - 1.0 mile.

What was the speed made good between 0045 and 0100?
288: According to your track line, how far off New Point Comfort Spit Light "4" will you be when abeam of this light?
293: At 1730, your position is LAT 37°13.9'N, LONG 76°26.4'W. You are steering course 088° per standard magnetic compass (psc) at an engine speed of 8.0 knots. What is your distance off Tue Marshes Light at 1730? 

    N a. 3.2 miles
    N b. 3.0 miles
    N c. 2.8 miles
    Y d. 2.6 miles
356: At 0410, you take the following bearings:

New Point Comfort Light "2" 242°T
Wolf Trap Light 313°T
Horn Harbor Entrance Light "HH" 262°T

What is your 0410 position? 

    N a. LAT 37°20.9'N, LONG 76°07.7'W
    Y b. LAT 37°21.0'N, LONG 76°08.1'W
    N c. LAT 37°21.1'N, LONG 76°07.9'W
    N d. LAT 37°21.2'N, LONG 76°08.2'W
388: From your 0745 fix, you change course to pass 1.0 mile south of buoy "WH" and estimate your speed at 7 knots. If the visibility clears, what is the earliest time you can expect to see Block Island North Light tower? 

    N a. 0845
    N b. 0838
    Y c. 0807
    N d. 0750
400: Your vessel receives a distress call from a vessel reporting her position at LAT 5°24'N, LONG 31°16'W. Your position is LAT 2°39'S, LONG 39°24'W. Determine the distance from your vessel to the vessel in distress by Mercator sailing. 

    N a. 669.3 miles
    Y b. 688.7 miles
    N c. 699.2 miles
    N d. 712.9 miles
483: The great circle distance from LAT 25°50'N, LONG 77°00'W to LAT 35°56'N, LONG 06°15'W is 3616 miles, and the initial course is 061.7°T. The position of the vertex is LAT 37°34.9'N, LONG 25°59.0'W. The difference of longitude from the vertex to a point (X) on the great circle track is 10°W. Determine the latitude which intersects the great circle at point (X). 

    N a. 37°02.5'N
    Y b. 37°09.5'N
    N c. 37°15.6'N
    N d. 37°21.2'N
496: At 0815, you change course to 079°T and head for the entrance of Great Salt Pond on Block Island. To compensate for a northerly wind, you estimate a 5° leeway is necessary. What course should you steer per gyrocompass to make good 079°T? 

    Y a. 071°pgc
    N b. 074°pgc
    N c. 076°pgc
    N d. 079°pgc
506: At 0112, what is the approximate depth under the keel? 

    N a. 57 feet (17.3 meters)
    N b. 51 feet (15.5 meters)
    N c. 47 feet (14.2 meters)
    Y d. 38 feet (11.5 meters)
593: What is the length of the trip? 

    N a. 1195.4 miles
    N b. 1223.1 miles
    Y c. 1520.1 miles
    N d. 1657.8 miles
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
675: You are planning a voyage from Godthab, Greenland, to Cayenne, French Guiana. Using chart WOXZC 5274, determine which statement is TRUE. 

    N a. Godthab is located at the Northern Hemisphere vertex.
    Y b. The rhumb line track approximates a great circle track.
    N c. A great circle track will be considerably shorter due to the length of the voyage.
    N d. Distance is measured by using the length of meridian at the point of tangency.
742: On 15 July , at 0447 ZT, your vessel's DR position is LAT 22°42'N, LONG 126°36'E. At approximately this time, you obtain a sextant altitude (hs) of Polaris reading 23°46.2' with an index error of 1.6' off the arc. Your chronometer reads 08h 48m 28s, and is 1m 16s fast. What is your latitude by Polaris, given a height of eye of 33 feet? 

    N a. 22°44.1'N
    N b. 22°46.2'N
    N c. 22°50.2'N
    Y d. 22°54.1'N
742: On 15 July , at 0447 ZT, your vessel's DR position is LAT 22°42'N, LONG 126°36'E. At approximately this time, you obtain a sextant altitude (hs) of Polaris reading 23°46.2' with an index error of 1.6' off the arc. Your chronometer reads 08h 48m 28s, and is 1m 16s fast. What is your latitude by Polaris, given a height of eye of 33 feet? 

    N a. 22°44.1'N
    N b. 22°46.2'N
    N c. 22°50.2'N
    Y d. 22°54.1'N
1005: On 18 May , your 1030 ZT DR position is LAT 20°41'N, LONG 63°32'W. You are on course 106°T, speed 24 knots. Determine your 1200 position using the following observations of the Sun.

ZONE TIME GHA DECLINATION Ho
1204 61°54.6' N 19°37.6' 88°39.7'
1210 63°24.6' N 19°37.7' 88°59.2' 

    Y a. LAT 20°32.6'N, LONG 62°57.5'W
    N b. LAT 20°30.1'N, LONG 63°01.9'W
    N c. LAT 20°27.6'N, LONG 62°52.4'W
    N d. LAT 20°25.2'N, LONG 62°56.9'W
1203: You are keeping ZD +4 on your vessel. On 21 June ,
at 0906 DST, your position is LAT 30°48.0'N,
LONG 71°00.0'W. You are on a course of 167°T at 15.2 knots. At what time will local apparent noon (LAN) occur ZT at your vessel? You are keeping DST. 

    N a. 1145
    N b. 1202
    N c. 1218
    Y d. 1245
1233: What is the distance from Greenville, MS, to Tiptonville, TN on the Mississippi River System? 

    N a. 95 miles
    N b. 136 miles
    Y c. 341 miles
    N d. 520 miles
1650: On 22 October , in DR position LAT 21°51.0'S, LONG 76°24.0'E, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears 256°psc. The chronometer reads 01h 01m 25s and is 01m 15s fast. Variation for the area is 2°E. What is the deviation of the standard magnetic compass? 

    N a. 0.3°E
    Y b. 0.3°W
    N c. 2.0°E
    N d. 2.0°W
1670: On 10 August , your vessel's 0426 zone time DR position is LAT 52°07'N, LONG 142°16'E, when an amplitude of the Sun is observed. The Sun's lower limb is about 20 minutes of arc above the visible horizon and bears 074.5° per standard compass. Variation in the area is 12°W. The chronometer reads 07h 24m 19s and is 02m 34s fast. Which of the following is the deviation of the standard compass? 

    N a. 0.0°
    N b. 1.3°W
    Y c. 1.3°E
    N d. 2.3°W
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
1860: On 22 March , your 1834 ZT DR position is LAT 26°13.5'S, LONG 108°36.5'W. You observe an unidentified star bearing 077°T, at an observed altitude (Ho) of 43°10.5'. The chronometer reads 01h 32m 37s and is 01m 50s slow. What star did you observe? 

    N a. Regulus
    N b. Menkar
    N c. Rigel
    Y d. Alphard
1877: 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 63°29.1' bearing 237.5°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. Kappa Scorpii
    N b. Beta Ophiuchi
    N c. Alpha Arae
    N d. Beta Draconis
1882: On 2 October , your 1845 DR position was 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 20°45.6' T, bearing 201.5°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 00m 51s fast. What star did you observe? 

    N a. Cor Caroli
    N b. Muhlifain
    Y c. Alpha Muscae
    N d. Beta Corvi
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
2011: On 3 February , your 0547 zone time DR position is LAT 24°18.5'N, LONG 167°25.0'E. Considering their magnitude,
azimuth, and altitude, which group includes the three bodies best suited for a fix at star time? 

    Y a. Regulus, Deneb, Antares
    N b. Altair, Saturn, Regulus
    N c. Arcturus, Kochab, Venus
    N d. Jupiter, Denebola, Regulus
2054: The Natchez Gage reads 16.3 feet. The high point on your towboat is 38 feet above water. What is the vertical clearance when you pass under the Natchez Highway Bridge? 

    N a. 79.0 feet
    Y b. 71.7 feet
    N c. 65.2 feet
    N d. 59.1 feet
2088: At your current speed of 19 knots you only have enough fuel remaining to travel 265 miles. You must travel 731 miles to reach your destination. What should you reduce your speed (knots) to in order to reach your destination? 

    N a. 13.8
    N b. 12.6
    Y c. 11.4
    N d. 10.2
2107: 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
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
2595: At 0145 you take on the pilot and are inbound Port Jefferson. The ship's heading is 147°pgc when lined up on the Port Jefferson range. What is your gyro error? 

    Y a. 1° W
    N b. 1° E
    N c. 2° E
    N d. 0°
2785: At 1650 you decrease speed to make good 7.1 mph. At 2020 you are __________. 

    Y a. abeam of Old River Control Structure Light
    N b. entering the Vicksburg District of the U.S. Army Corps. of Engineers
    N c. at Palmetto Point
    N d. at Latitude 31°10'N
2901: You are steaming on a course of 198°T at 18.5 knots. At 0316 you observe a lighthouse bearing 235°T. At 0348 the lighthouse bears 259°T. What is your distance off at the second bearing? 

    Y a. 14.8 miles
    N b. 15.3 miles
    N c. 15.8 miles
    N d. 16.3 miles
3112: While enroute from Montevideo to Walvis Bay a vessel's course is 116°psc. The variation for the locality is 25°W and the deviation is 6°W. What is the true course made good if a southerly wind produces 1° leeway? 

    Y a. 084°T
    N b. 086°T
    N c. 148°T
    N d. 085°T
3262: You have steamed 632 miles at 18.5 knots, and consumed 197 tons of fuel. If you have 278 tons of usable fuel remaining, how far can you steam at 15.0 knots? 

    N a. 681 miles
    N b. 892 miles
    N c. 1100 miles
    Y d. 1357 miles
3264: You have steamed 1134 miles at 10 knots, and consumed 121 tons of fuel. If you have to steam 1522 miles to complete the voyage, how many tons of fuel will be consumed while steaming at 12 knots? 

    N a. 146 tons
    N b. 189 tons
    N c. 200 tons
    Y d. 234 tons
3273: Your vessel arrives in port with sufficient fuel to steam 1175 miles at 19 knots. If you are unable to take on bunkers, at what speed must you proceed to reach your next port, 1341 miles distant? 

    N a. 16.7 knots
    N b. 17.3 knots
    Y c. 17.8 knots
    N d. 19.4 knots
3312: You have steamed 199 miles and consumed 23.0 tons of fuel. If you maintain the same speed, how many tons of fuel will you consume while steaming 410 miles? 

    N a. 32.6 tons
    N b. 39.9 tons
    Y c. 47.4 tons
    N d. 97.6 tons
3623: Your vessel is steering course 166°psc, variation for the area is 8°W, and deviation is 3°W. The wind is from the west-southwest, producing a 2° leeway. What true course are you making good? 

    Y a. 153°T
    N b. 157°T
    N c. 175°T
    N d. 179°T
3624: Your vessel is steering course 073°psc, variation for the area is 15°E, and deviation is 4°E. The wind is from the southeast, producing a 4° leeway. Which true course are you making good? 

    N a. 050°T
    N b. 058°T
    Y c. 088°T
    N d. 096°T
10600: At 1620 your GPS indicates a position of LAT 41°09.0'N, LONG 72°40.0'W. You are on course 134° per standard magnetic compass at a speed of 10 knots. At 1700 your GPS indicates your position as LAT 41°05.3'N, LONG 72°33.7'W. What were the set and drift? 

    N a. 067°T at 1.7 knots
    N b. 078°T at 1.1 knots
    N c. 243°T at 1.0 knot
    Y d. 249°T at 1.6 knots
11101: Great Salt Pond on Block Island is __________. 

    Y a. entered through a dredged cut
    N b. not accessible in easterly gales
    N c. available for vessels up to a maximum draft of 8 feet (2.4m)
    N d. not affected by the tide
12604: You are on course 082° per standard magnetic compass (psc) when you take the following bearings: New London Ledge Light - 036.5°psc Little Gull Island Light - 157.0°psc Saybrook Break Water Light - 294.5°psc What is your position? 

    N a. LAT 41°02.3'N, LONG 72°04.5'W
    N b. LAT 41°09.5'N, LONG 72°07.1'W
    Y c. LAT 41°13.6'N, LONG 72°07.5'W
    N d. LAT 41°14.1'N, LONG 72°12.8'W
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
15515: You decide to use the 9960-Y and 9960-W rates. At 1915,
you obtain the following readings:

9960-Y-43936.0
9960-W-14653.3

What is your 1915 position? 

    N a. LAT 41°13.0'N, LONG 71°54.0'W
    N b. LAT 41°13.1'N, LONG 71°53.9'W
    N c. LAT 41°13.2'N, LONG 71°54.3'W
    Y d. LAT 41°13.2'N, LONG 71°53.7'W
15569: The coastline between Point Judith and Watch Hill is __________. 

    N a. marked by waterfalls from the highland ponds
    N b. low and marshy
    Y c. sandy and broken by rocky points
    N d. heavily forested
15718: Your vessel is entering New London Harbor Channel. If there is no current, what should you steer per gyro compass to stay on the range? 

    Y a. 351°
    N b. 354°
    N c. 357°
    N d. 006°
15738: At 1830 you obtained the following Loran-C readings:

9960-W-14820.0
9960-X-26097.0
9960-Y-43713.5

What is your vessel's position? 

    N a. LAT 40°41.0'N,  LONG 72°06.0'W
    N b. LAT 40°41.0'N,  LONG 72°10.6'W
    Y c. LAT 40°42.5'N,  LONG 72°07.1'W
    N d. LAT 40°47.5'N,  LONG 72°02.9'W
15810: You alter course from your 0045 position to head for a point 0.5 mile north of Mattituck Breakwater Light "MI". If the visibility is 10 miles and you make good 9 knots, at approximately what time will you lose sight of Saybrook Breakwater Light? 

    N a. You have already lost sight at 0045
    Y b. 0055
    N c. 0120
    N d. The light is visible all the way to Mattituck Inlet
16256: What is the course per gyro compass from the anchorage to point A located 0.5 mile east of Cape Charles Lighted Bell Buoy 14? 

    N a. 180°
    Y b. 184°
    N c. 198°
    N d. 199.5°
16441: When you get underway, you will take the most direct route to buoy "CBJ", while remaining west of York Spit Channel. You will be turning for 9.7 knots and estimate an average ebb of 0.3 knot during the transit. How long will it take to steam from the anchor position to buoy "CBJ"? 

    N a. 2h 16m
    Y b. 2h 33m
    N c. 2h 42m
    N d. 2h 51m
16469: As you pass between trestle "B" and trestle "C" of the Chesapeake Bay Bridge - Tunnel, you sight along the trestle "C" when it is in line. The trestle bears 057° per standard magnetic compass while the vessel is heading 320°T. From this you know the __________. 

    Y a. vessel should be swung to check the deviation table
    N b. compass error is 12°W
    N c. deviation table is correct for that bearing
    N d. deviation is 10°W
16614: Branford Reef is __________. 

    Y a. completely submerged at all stages of the tide
    N b. a hard sand shoal
    N c. surrounded by rocks awash at low water spring tides
    N d. a small, low, sandy islet surrounded by shoal water